Fluidmaster 400a - Installation 

I'm 65 years old and just changed out my first fill valve! You never know what you can't do until you try. Thanks for your help!

OMGosh! I did it! Watched two of your videos on replacing the fill valve and followed your instructions, and, it's done! My husband stood by and watched, then applauded, when the job was done. And he wanted to call a plumber! Thanks so much!

Thanks mate, helped me fixed my toilet! For any aussies watching this I brought it from bunnings and we dont have the overflow tube.

Omg I love the trick of pulling the part off and replacing it!!! I’ve been living with a bad part too long for a 1 minute fix!!! Thank you so much!!

I first initially replaced my old-school toilet valves (3 bathrooms) back in 2000 (bought them at True Value). Then I replaced them all in 2008 (bought them at Home Depot). Now I’ve replaced them all again in 2016. (Bought them at Home Depot again).I too am sold on the fact that the Fluidmaster 400a is my one and only choice for the toilets. Having done a search today on RU-vid for “Fluidmaster 400a replacement” I stumbled on this video. This is so much better than reading the instructions on the unit. This vid was an exceptional refresher for doing a fluidmaster replacement.One other note. I stumbled on other videos showing the replacement of the seal on the unit vs changing the whole unit out. A whole new unit is only 7 dollars and some change at Home Repo vs 3 dollars and change for the seal. I just changed the whole thing. Besides if you change the seal on the old one, it’s still going to be all crusty full of calcium.Time to change the unit: 20 minutesTotal cost: $7.48 plus tax.Thanks a lot for the refresher sir!

Thank you SO MUCH for this video. The extent of my toilet repair history is to remove the lid and say "huh." And promptly put it back on. Now I can say I was able to replace a fill valve all by myself! And you even showed me how I could do a shortcut by using my existing shaft (since I only had a problem in the head) and not even have to drain it completely and do all those other steps. You are awesome and I really appreciate it. My husband was really glad I didn't ask him to do it...ha!

As a person who doesn't comment much, I have to give credit where its due. I read the instructions step by step but this video was very informative. Simple tutorial and great usage of the two cameras. You never know who may need the slightest bit of info instead of shelling out hundreds of dollars. Hats off to you sir. Keep up the good work. Thanx

I had a problem with the tank not filling up and had been dreading replacing the entire Fluidmaster fill valve. Thank you so much for the tip about pulling off the old Fluidmaster assembly and just sliding the new one on. What I thought would take about half an hour turned into a one minute repair!

Success!!! I followed the instructions, ordered the recommended part and now I have a perfectly functioning toilet. Having made this repair, I now understand how to make micro adjustment as they are needed. The inside of my toilet is not longer a mystery to me. The instructions were great! If this 68 year old woman can do this repair, anyone can. Just follow the step by step instructions and demonstration. BTY, it was very nice to have Molly poking her nose into things!

Thank you so much- the landlord turned the water off to my buildings for some repairs and when it came back on, the force of the water blew the hose off in the tank. Thanks to you I could reconnect it myself without waiting for and dealing with the landlord!

One of the better video's that I have seen. Talk's all the way step by step.

Thank you Thank you Thank YOU!!!! I'd been working on my toilet and was fed up trying to figure out why the tank wasn't filling. In the first 4 minutes, your tip of pulling the piece apart in the fill valve to replace a clogged one, I ran to my bathroom and did just that. IT WORKED!!! Oh, thank you so much for saving me so much time and another afternoon of hanging around my toilet. Thank you!!!

My 14 yr old just followed your easy video and the toilet is now working properly. Everything on the outside is dry and the inside is working! YAY! Thank you for making this video :)

You have a great talent for tutoring/Instructing. You did a excellent step by step instruction. Today, I had to replace my flow, and remembered I had bought one of these some time ago without the instructions. You step by step was perfect. Thank you so much, and keep up the great work.

Thank you Sir! Three years later and this video is as relevant as ever. The short cut made a big difference since I did not have to completely drain the tank.

Awesome video - thanks so much for the secret about removing and replacing just the valve and not the whole tube - saved me a lot of time! Wish I had known about that for last 20 years!

You're a life saver man. The leaky toilet in my daughter's bathroom has been bugging me for awhile and thanks to you, it's fixed. I really appreciate your time and extremely detail step since I'm no handy man so I needed every detail step.

Thank YOU!!! My very FIRST time trying to replace the fluid master!-Your clear/concise and detailed information ( and the tricks ) made it possible for me to succeed! I’ve subscribed so I can learn even more from you! I also appreciate how you made sure the view of the inside of the tank was lighted and seen from your camera mounted above. Thank goodness for the pause button and rewind! Finally ..love your dog checking your progress! (My 2 cats did the same but offered no advice 😆) Aloha from a grateful senior girl in Honolulu🌴🌴🌴

This video was awesome. My husband really appreciated the shortcut in not having to take it all apart. It was done in no time!! Thanks alot

Very simple- I'm a 64 year old widow, and have always been the handyman...plumbing was the one thing I shied away from. I am reusing the existing model of this same set, as a temporary measure. It is old and the valve is chewy. I took everything apart and trimmed a bit of too-long hose. I will be completely replacing the entire works asap, since the unit is over 5 years old and the tube is stiff and crimped. I had a slow refill problem, but by taking everything apart and cleaning it, it all seems to work. This is the PERFECT video for exactly how to do it. Just do make sure that your nuts are tight- my hands are not strong, so I used a rubber jar grip to turn that last bit by hand. Thanks so much for a great video!

I have to say it was very easy to install the 400AH. It took me a little over 30 minutes due to the fact I had to clean out the tank. it had some sediment (hence old house). Thanks for your video. Of all the ones I looked at yours was very specific, video was very clear and instructions were great. Thanks!

Thank you for this video !!! The level of detail you provided at each step was so helpful !!!! .. From the sponge used, to the bucket , to right tighty - lefty loosey, to changing the Ball style fill valve...!!! You are an amazing teacher !!! I had to use a 1 1/8 " 12 point socket with my ratcheting socket wrench to remove the nut from the old fill valve...my hands were not strong enough to use a wrench or pliers to remove the nut from the old fill valve ...

Thank you so much this really helped me. My daughter and I replaced the fill valve. I'm so excited!

Man you are good and saved me from the plumber fees.( These days he won't make it due to business). Your presentation is excellent ,very clear and communicative. You did not miss a bit. God bless you and your family this thanksgiving and thanks to you I am ready for the family to show up.

Nathan, this video was a big lifesaver. Instead of paying a handyman, I decided to give a try along with my 14yr old nephew. He took the lead and I help guide him with your simple instructions... We don't think we could of done it without your help/guidance! You just picked up a subscriber and who knows what we dare try next with your help:-) Thanks & God Bless!!!!!!!

The best demo of several I’ve watched. I would have purchased a grout sponge if I had seen this first. None of the other demos I’ve seen had the part about separating and reconnecting the lock ring. I am about to get to work! Thank you!

thanks! this is the model I bought and then searched for a video to show me how to install it. I was quite happy to see the same model I bought used in the video. Your video was very clear and so so helpful. Thanks again!

Glad I just read your reply from two years ago to someone about most of the water coming from the bottom of the valve. I thought mine was cracked or something, and was about to go back to the store to buy a new one. Thanks!!!

Hey, I have the same bucket!! Except mine is the all-purple "All-in-One Primer & Sealer". For a long time, I had been dreaming of acquiring a bucket, and of all the things I could do with it, all the things I could carry in it, such as water, fish, mud, soil, sand... I used to have access to lots of buckets, but they would tend to get lost, cracked, or punctured. Then there was the frustration and agony of not finding a bucket when I could really use one. People told me to put it on my bucket-list to get a bucket, but I didn't have a bucket to make a bucket-list with. It then occurred to me that I should claim one of the many empty paint buckets from work. Having a bucket changed my life. Oh, and great video.

Your thanking us for watching, I thank you for a top shelf tutorial. Absolutely loved seeing your two dogs inspecting your fine work. All the best from New Rochelle N.Y.

Wow, what amazing instructions. That increasingly louder droning sound following each flush became history in a matter of minutes. And that is from arguably the least technical guy in the world. Thank you!

Great video. Explained things in detail so us diy'ers (like me) can make sense of it. Well done! George

This is the video I needed to withdraw the unit without twisting. Even Fluidmaster's own videos do not tell you how to pull out the valve unit without disconnecting the plumbing. My valve unit cannot be rotated as per the website because my so-called plumber (you've got to love a British plumber) fitted it on the same tight corner as the syphon and there is no room to rotate it. Great video from an intelligent plumber.

I did it!!! 5 mins. I just popped off the old one and popped on the new one. Great time saver. Thank you!

Thank you so much for the video. I am 70+ and just finished my plumbing job - thanks to you! If I can do this - anyone can.

Although Fluidmaster has a replacement fill cap, I chose the entire fill valve. My original Fluidmaster was around seven years old. Why not spend the additional $$$. Just made sense. Thanks to your video, it was a 10 minute fix over the existing pipe. You saved me close to $150. Being retired, that is very helpful !!

Thank you so much for this video. It was easier to replace just the top part of the Fluidmaster than what I was trying to do - disconnect the whole unit. That locknut under the tank was impossible to loosen. Thanks again.

You saved my nerves and sanity, I just fixed the fill valve just by removing the top. I don't have strength in my hands/fingers so screwing things tight don't work with me. You also saved me calling a repair man that would have charged me a ton of $$ just to do what I did. Thank you.

Holy cow!! I had my bucket, wrenches, and sponge ready to go when I heard you say "pop the old one off and stick the new one on." Done in less than 3 minutes!!!!!

Thank you, I followed this video and was able to change the valve myself for a grand total of $8.

Lifesaver. No one else really went into how to disassemble the valve itself, and that is what I needed to know, since mine got stuck when I tried to adjust it upwards in the tank and water was just spraying everywhere. I didn't know you could just pull the entire top of the stalk off and reseat it. worked like a charm.

Appreciate your tutorial. Wanted to come back after my installation and say thank you. Prepping it by pulling off top assembly made the install easier.

WOW, I've never fixed a toilet so fast. I only had to replace the float. Did what you said, pulled the old off and slid on the new and locked in place. I'm definitely subscribing to your channel.

This showed me everything I needed to know to change the flush valve myself, including the nuisances the instruction booklet skips!

I did exactly what you said and fixed it first time without even having to make any adjustments to the water level. You saved me about $60 to $70 on a service call. Thanks for the video.

Thank you so very much in putting up such a detailed video. I"m a senior woman, and this helped me so much in saving money and I learned something new-----Thanks

after watching 4 other vidoes, yours had the most clarity! thanks!!

This video helped solve the problem of why I couldn't get the black tube out of the grey stem. I just had to push the locking nut back and pull hard! It won't break. Thanks Nathan.

That was excellent. Followed your instructions, and replaced the toilet valve float without a problem!

Very helpful. Especially the brute force tip!! Thank you Some additional tips for those who follow #1 If you have a turkey bulb baster, you can suck up the residual water (remember it IS clean) and send it down the toilet drain without worrying about sponging it out. Less drips all around #2 Once the water is gone from the tank, two washcloths on either side of the toilet drain are easier to use than one bulky towel to dry out the tank. #3. A small mirror under the water connector and old fill valve lockscrew will let you mimic the smaller picture in the video.

Great video ... I just used the first trick ... pulled the old one off the plastic tube and replaced. No tools needed done on about a minute. Thank you !!!

I found this super easy to follow and the trick of using the existing stem saved a heap of time and mess.

Thanks, everything worked as demonstrated. I had to use a little teflon tape because the water line was old...

Doooood, great video. The little trick replacing the fill valve by popping the locking ring and re-using the already installed post? Awesome. Literally took 90 seconds. Turn off water to toilet, pop ring on old fluidmaster, unclipped overfill hose, pulled off old fill valve, pushed on new fill valve, attached new hose (could have skipped this technically but new hose has a fill rate clamp), locked the ring back onto the post - DONE (minus adjusting the fill level and the bowl fill rate clamp) . Thanks!

Just used this video to replace my fill valve and it was perfect! Probably saved me $200. If you had a donation page I would totally donate. Thank you!!

Finally, someone who posted the little details of adjusting the valve and float with the installation process. Thank you!

We just changed our valve for the first time! Your video was extremely helpful. Thank you.

Great video. The trick you showed in the first four minutes saved me a ton of time over the instructions included with the product. Thanks!

Thanks so much for your help. With your clear and straightforward assistance I was able to do this!

Omg, I can't thank you enough! I put it off and put it off, but once I saw your video and went for it, everything worked out in the end. Getting that NUT off was a beast but you gave awesome advice. All the best 2u in 2021! :)

Thank you for the video. I came tp the web with a question about the Fluidmaster 400A fill valve and found this video. Not only did this video answer my question, it also made several valuable suggestions. Made the fill valve installation much easier. Thank you. 10+

Thank you so much for the tip about pulling the entire upper assembly off. after following your advice it works perfectly saved me from a plumbing nightmare as I'm a little Closterphobic.

Great video. Your shortcut saved me much time and effort. Thanks again

thanks so much. super straight forward never did it b4..with your help took me 20 mins!

Thanks Dude, I pretty much knew what my toilet issue was, but this clarified everything! Great job on the production/split screen, just wish I hadn't have left all my tools at another job. Keep up the good work and all the best!

DUDE!!! Thanx for those hacks!!! Without them I was like a one legged man in an ass kicking contest...just knowing to pull the float assembly off the supply stem saved me HOURS of that cussin', crampin' & cleanup....Thank you so very much!!! Under normal (pre-stroke) conditions, I wouldda had it done without consulting your vid...at least the stroke was good for something...your quick work hacks...no leaks or major cleanup except for the much needed floor cleaning which clearing out all the detritus that accumulated over the past number of months/years around the commode made easier... CB in FL

Thank you for the video. Only took me a few minutes as I didn't need to take out the hose/bottom seal part. Saved me so much time and stress after seeing how its done.

I'm 64 with no real plumbing experience (except that time I twisted a shower head too tight and snapped the copper pipe in the wall and flooded the wall cavity). I changed out the flappers on 2 constantly running toilets yesterday but they still run. So today, it's Fluidmaster time! Thanks for this video...looks just as easy with your help.

Thanks! I'm replacing mine now that I know how; good video, and more of the dogs please lol

Just changed the fill valve based on your video review - works great, thanks !!

Exceptional Video Sir! Thank You for taking the “Intimidation Factor” away! I’m feeling more confident I can do this without borrowing one of my male buddies to repair it for me!

Did just like you showed, had a little problem getting the old valve nut off but after that smooth as could be. Thanks!

awesome, thank you, watched, went to homedepot, got the part, came back, installed it, and watched the end of the video again to make sure i didnt miss anything, took about 10 minuets with cleanup and all, yay!, fwiw, im the one that just touches plumbing parts and water will leak, so far so good!, no leaks and works perfectly, yay, yay, yay!

OMG MAN THANK YOU SO MUCH.. u made it look so easy and i was struggling, first it was hell trying get the old one off and noone said take that lil cap off where the old tube was.. ugh.. u a life safer.

Thank you!!!! The instructions in the box are not very good. You're video was VERY helpful!! Saved me a ton on a simple repair.

Thank you so much for this video tutorial!! Replaced two this week and thanks to your help on this video it made it suuuuuper easy for me to follow!!

thanks for the help, just need adjusting.

Perfect! Good tips on the sponge (we used a couple of shammies) and on how the stem separates from the rest of the unit. Also the directions on the hand tightening. Great video!

Very well put-together, sir. Appreciate all the tips and the great camera angle.

Great video. That dog of yours is soo cute, and curious. He didn't want to miss even a single bit of your instructions. He studied the valve you placed into the bathtub so intently, that I'm sure he now knows exactly how it works.😂🤣. I was a bit disappointed that after the installation, you didn't at least flush once to demonstrate how it is supposed to work when properly installed!

Just did my 400A successfully. The boxed instructions are very confusing. In step 2 it says "DO NOT MOVE LOCK RING it holds the body and shank together." As you pointed out "moving" that lock ring is necessary to adjust the core. You popped the ring easily however I had to grapple with mine since it was REAL TIGHT. It also says that 8 turns on the float screw represent one half inch in water level and I found that I could get one half inch in about 5 turns. My toilet now fills quicker and sounds operationally healthier. Bought mine at Home Depot for $7.48 plus tax. Some universal valves come in blister packs but I love the easy to access cardboard box. I would have paid $19.99 for Kohler's OEM valve online so I am very happy. I have a K4634 toilet with no flapper so mine may be newer than the toilet in your video. My model number was inside the tank however it was not where Kohler said it would be and it was stenciled and not carved in the china as they also said it would be. No leaks at all!! Thanks for the video RU-vid is the best but it is the people who make that way.

I am not terribly handy, but I was able to follow your instructions and replace this part painlessly. Thank you!!

Thank you‼️ Your video 💥 was awesome‼️ It made this 🚽project so easy for me! 🎼 It is so nice to have a man around the house!😂🤣

Thank you!! This video was the most helpful!! I did it myself.

What an excellent video! I first watched a video made by some New Yorker who sounded like Sylvester Stallone, but it was almost completely worthless. This guy explains important details and helped me overcome a simple problem with adjusting the height of the valve.

for this part of repairing a toilet this is so well said this needs to be for teaching lesson in plumbing trade school, very well done.

thanks man. $8 at home Depot and your video fixed my problem.

Great video, simple to follow and a lovely gentlemen . I was able to follow every step and it worked first time for me...Thank you!! 👍🙏

I just installed one of these on Thursday. I wish I had as much room under my toilet as you have on that one.

Thanks for your concise video---love the furry supervisors in the background!!

Great demo video, well done. I love your dogs. They are just as passionate about toilet repairs as you are 😍

Great video. Your tips made this such an easy job. Thank you.

Hi Nathan, there is something I would like to share with everyone. When I install the fill valve, I did not attach the little clip to the hose like it suppose to. I place the hose inside the overflow. That will cause the water to flush into the toilet and every five minutes it will cause the tank to fill with water again.......I did follow your instructions with the hose and now my toilet is working fine......Thank you a lot.

Followed the video, installed the fluidmaster in a matter of a few minutes . Installation went just like you said in the video. Well done. And the tip about exercising the valve length adjustment first and then pre-setting the valve height was brilliant. Thanks again

NIce quality and very efficient thank you.

Thanks for the video. I couldn't have done the replacement without it.

Great shortcut - done and done in 7 min., working great now.

Thank you for explaining how difficult that EZ Twist valve is to remove. I couldn't do it! Lucky me, my husband came to the rescue! lol

Thanks for the tip about replacing the top piece. I replaced mine, which groaned like a dying water buffalo, without any tools or even shutting off the water supply!

thanks for posting this very easy step by step video. i was able to replace the old broken one without much of a fuss. thumbs up!!!