The #1 DWV Plumbing Mistake (and how to prevent it). 

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This guy is doing the Lord’s work, I tell ya... what an incredible resource.

As a master plumber in Colorado and Washington I stand by this video. Thank you for giving folks this info.

Former Montana state plumbing inspector, it would be nice to see more videos like this. So many homeowners wanting to do their own work get it wrong and wind up spending three to four times the cost. And when in doubt, call your local inspector. They are more than happy to come out and look and it WON'T COST A DIME! Better to be safe than have a real mess in the end.

I have been doing plumbing for 56 years, with the last 38 of those years working for myself in Australia as a licensed plumber, roof plumber, drainer, gas fitter and LPG installer I have seen many changes in the industry, some not good but most were. As an apprentice, I spent 5 years studying, 3 years to become a journeyman and 2 years of advanced plumbing to become licensed. I began with earthenware drainage pipes joined with cement, copper for hot and cold water, with copper wastes into cast iron stacks in multistory buildings. Also galvanised steel pipes for gas lines. Today, almost everything is in plastic. The worst is that a plumber today is more interested in the money than the job. Most of them think of a plumbing license as a license to print money. Even though as I am approaching 72, I still work part time as a licensed plumber. I like it too much to give up completely. There is some differences with what we call the fittings. For example; a sanitary 'T', we call an 88° square junction. We don't have "a combo wye and 1/8 bend", we just add a 45° bend to a 45° junction. We never use fractions to describe any fitting, only ever the degrees that it is, that reduces confusion. Our sanitary bend fittings come in 5, 15, 30, 45, 60 and 88 degrees.

Wow! This is among the best-produced and thorough youtube videos I've ever watched. I'm preparing (watching lots of videos and reading plumbing books!) to replace my entire DWV stack and the bathroom fittings in my 1920 house. As soon as I can scrape together $50 for your ebook, I will definitely buy it. Again, great video.

Thanks. I was getting ready to convert a single sink drain into a double and I think you just saved me a headache.

recently corrected plenty of these mistakes in a house a bought and currently doing a full house remodel. as well as added more venting. Before they decided that the waist pipe going from upstairs to down stairs needed more venting so they just drilled 3/4 inch holes on top of the pipe... you cant make that shit up. they tried to make the upstairs sink and shower drain uphill into the main which of course doesnt work. They used Ts instead of wyes or combos, used short radius 90s instead of long radius, ran to small diameter piping in places and went from 1 1/5 down to 1 1/4 from a banch to the main. found several joints incorrectly mated. decided glue was all it needed. lacked true supporting of piping which had sagged over time. a lot of which wasnt noticed until you removed the 3 foot of insulation off of it, or pulled the drywall to see it. Or well lack of drywall and more paneling. Even the domestic water was a mess, PVC main, switch to cpvc to copper back to cpvc, back to copper. ripped it all out except the main, added a true main shut off inside the house back at the point it comes out of the ground. I know some will boo and hiss, but i went with pex as a replacement. In union commercial construction anyway. Most of the guys were telling me why not copper, pex isnt real plumbing. I said The price. Im doing it out of pocket, copper is nice and i dont mind it when im not paying for it. but I couldnt justify using copper in my house do to the price. so I went with pex and used the copper crimp rings vs the stainless pinch ring. No shark bites, ive seen those fail to offend. I have used the caps for temporary while testing or getting some plumbing working to at least have running water. I was going to use a pex manifold but for this house i couldnt justify the cost of one. but none the less i did install isolation between upstairs and down stairs as well as a shut off before and after the water softener and water heater. Might be over kill but if something happens i want to have control quickly.

This is the first video of yours I've seen, fantastic information and providing things free is above and beyond, sir. Thank you and Godspeed Mr. Spitz!

Thanks for posting this - best I've seen so far. I'm not a plumber, but I like to know what's going on so I can make sure work is done right when plumbers do it, and for easier tasks, when I do it.

Awesome! Laymans description of what to use. This will be quite helpful when I get to the plumbing portion of my house build.

As a drain tech I thank you for this, I hope an installer learns from this. One other thing that is code that I wish wasn't is the use of double wyes. A sewer cable has a very difficult time with making the turn. It almost always goes straight across unless there is a length of pipe between the wye and 45. Usually they are put in with street 45s into the wye or are part of the fitting itself. I have watched on camera cables going right across these fittings. I have also watched waste getting deposited up into the opposing branch after a toilet flush. The waste is pushed up and is left there as the water drains out. If the branch that is receiving this waste doesn't get used much it will eventually become clogged from the other branch line. This was a serious head scratcher for us until we actually witnessed in on video.

Amen Hammerpedia! I've been cleaning drains & sewers for over 30 years. You are dead on. Nothing more frustrating than a tee when there should be a combo or wye. I recently cleared a bathtub line where the homeowner did his own plumbing. He said he couldn't get the trap to line up with the tub drain, so he built a "360 degree loop" followed by a p-trap. My stomach sank. This was in the basement with a concrete floor. Getting a 1/4" cable through it was hell, but with lots of persistence I got the cable through and into the main sewer. The water drained great. There was just one problem.........I opened the back flow prevention device (it was about 5 feet away) and I saw the cable in there. Problem was, there was no water coming through. Hmmm. That means the pipe broke under the concrete. Sorry mister homeowner, but if you don't know how to plumb, this can be the result. Last I knew, he was jack hammering his basement floor. Thanks for the video.

No matter when you recorded this video; it will always be relative as long as there is “PLUMBING “! I Am going to use this info. Now!

Great video. You showed us handymen important complex information in an easy to understand way. Thank you for sharing your knowledge!

The National Standard Plumbing Code used in New Jersey allows short pattern fittings to be used in horizontal to horizontal changes in direction. But only for individual fixtures.

I swear our computers are listening in on us, only last night my neighbours emptying of her bath tub resulted in much gargling in my bath waste. Her dad is a plumber! and ever since he made an alteration in her bathroom my bath drain is noisier, To cut along story short, it woke me up, the computer must have heard my rantings and low and behold just the following day the 'potential' answer, come source of my troubles is most likely in this video. Thank you for posting, so nice to hear from people with a really professional outlook and conduct. I do a bit of plumbing myself sometimes so I am without doubt taking on board what you have said.

Can you make more videos please? I'm an apprentice plumber and your videos are the best I can find.

Thanks for sharing this. Great information. As a plumber for 35 years, I tell inspectors all the time to call me if this line backs up so I can watch a maintenance man pull a ceiling cleanout plug for a stoppage on floor above. He responds and said "It's the code" and I say "don't forget to call me!" Lol

Old Builder here (72) and it makes me chuckle to see how many "master plumbers/inspectors/pros...." comment here after watching! :-) You figure they wouldn't need to be watching any of this on YT, right? haaaaa.... Me...I just like pretty pictures :-) Thanks for the show!!

You Sir are the Best at Plumbing Knowledge & a Life Saver for providing your Amazing guides to you're viewers. I have Liked, Subscribed & now commented on you're video ..this is the least I can do, to show my appreciation for you're work...thank you!

I am an apprentice but Ive ran into this a lot surprisingly, Im glad my boss taught me up on the subject

Thanks Dylan! I could have saved myself a failed rough-in drain plumbing inspection had I seen this video first. :) I just received your free PDF download cheat sheet for this. Thanks! I got the impression it was going to be more than what you showed on the screen during the video, but I like it and saved it for future reference nonetheless! Looking forward to more videos! :)

I immediately subscribed to your channel because of the informative code and extra details in your video, Thank you so much for your time and efforts sir, God Bless.

Exactly what I found under my house that’s clogged🤦‍♂️ Great video-answered every question in minutes!

I'm remodeling a bathroom and find this video to be of great help. Thanks for posting.

I don't always turn 90, but when I do I use a long sweep! Keep it long my friends!

Great job. You have a really good voice for narration. Very clear and articulate.

Hey thanks for taking the time to do this. Awesome information!

Anyone running DWV, should have these basics in the forefront of their minds when slinging pipe

Thank you very much for the information, just moved to a house with this problem, toilet so closeto a T that waste backs up!!! now I now how to solve the problem

Thank you! I am turning a washing machine drain into a shower drain and appreciate this info :)

Useful information. In short, when in doubt, use the largest radius bend that you can fit in the available space.

Today is the last day of 41 years of doing plumbing. And it's not like I took time off to do something else. Too bad. All that I've learned in that time will now disappear into the mist. It will have to be learned by a newby all over again. Nobody is interested. Mistakes will be made, over and over. And the clients will bear the brunt. The march of time.

In San Diego we just shit in the streets. Toilets are for the millionaires.

I wish I could do videos like this. I save your videos to show Construction apprentices that get assigned to my big jobs.

Trick I learned from a Australian plumber years ago. Have to install a toe tap tub waste on a slab? With plastic tee,boot and overflow? Lay a piece of plywood on the floor and tack a piece on the studs. Use a pencil to mark the plywood through the holes. Then, pull aside the tub, make your measurements, using your marks. You'll never have a boot too low or too high. Same with the overflow.

After observing failure after failure during inspections of master plumbers installations/ rough-ins, I’ve just come with a few simple rules that guarantee avoidance of most issues. In the case of this video, the rule is simple: NEVER use a sanitary T in drainage except in a vertical orientation at a trap arm connection. No need to learn all the do’s and don’ts when following one rule is all that’s needed

Thank you for this easy to follow advice !!

I purchased the course and it is excellent.

Thanks Dylan! Big up to you sharing when the people!!!!🌺💚🔥

Gr8 vid … Thx for your time, effort and energy in putting together this concise informational video. Kudos. Cheers,

Thank u for the video u made it very simple to figure out what to use in this application

Heck with 90's use all wye and 1/8 bends with a fitting clean out on back when there's room in your own home the future accessibility is great

Very well explained on waste vent piping and sweeps..Thank you

Watching this as I'm driving back with the sanitary tee to do the job. I guess I'll turn around and take you back. Thanks for clarifying

This is why I always call a pro for larger projects

As a Master Plumber & Gas Furnace Installer in Scotland, I 100% approve of this video. It's the same over here.

Hi sir Dylan. Thank you very much! your videos helps me a lot to do my job right hence I am fixing my own house plumbing.

This was very helpful and thanks for the information

Most of the problems are back flow and or sucking the P trap dry. I agree with your video. However I would do a back up video of why these codes exist. To explain proper venting, back flow or P trap safety. Such as keeping out sewer gas and the reason these codes exist to prevent future problems, or dangers of not having proper flow, vrs suction. Good video by the way. I believe the more people understand why these codes exist, the more likely they will follow the codes. ;)

I've had this argument many times with my Foreman that we need to use sweeps instead of 90's. In Georgia its common to use 90's. I think the reason my company and foreman are so cool with using 90's is that they cost less, but I also feel its because they've always been new construction plumbers and not service plumbers. They don't realize how much more of a pain in the ass a 90 can be to snake a cable through. A sweep is much easier to service.

if you are watching this video to learn plumbing may i suggest buying the illustrated plumbing book. also attend a class about backflow. Find a plumber that has years of experience doing residential and commercial construction. Check with your local utility and see if thay have seminars on heating. Learn about controls regulation venting and venting.

This is great info and it’s nice to have a short to the point presentation but it leaves a lot of questions unanswered. Does this formation also apply to ABS? Does this formation apply to only certain diameter pipe?

Thanks for all this great info

This is for directional flow having to do with drain cleaning. I believe it’s still code in my area to use a double wye but if it were up to a lot of local plumbers they would make them illegal to use , either above or below ground.

Thanks for the free guide brother! God Bless!

Very cool of you to prepare a video on this. Thank you!

Hydroponicist here and I found this very enlightening but not usually what I do with PVC pipes.

That's why we have plumbing codes and inspections.

I am plambar in India . You. Are knowledge is very good.

Hello Dylan, My question is, Is it allowable to drain a toilet toward the front and have venting coming from behind?

Thank you so much. Amazing video

Very cool short, informative vid. Ty!

Thanks Hammerpedia, legend

Glad I found your channel.

Great info, many thanks!

Incredibly knowlegeble video. Many Thanks!

This is especially the case in apartment buildings where clogs and buildups are far more inaccessible in many cases and a snake trying from horizontal drain trying to go down a T , is really frustrating ,even with a floating head on the snake why oh wye didn't they figure this stuff out long ago

Thank you for the very valuable information.

Thank you for such helpful in depth info

I've worked in both UPC and IPC areas. I always preferred the UPC due to its higher standard (fewer allowances.)

I'm so glad that I live in an area that doesn't have any building codes. No added expense, and no problems.

Thank you so much, I need this information!!

Thank you. I have a house infrastructure is coming up the road and I want to be ready to connect. Anyone please let me know about where i need to be with depth in relation to public works. Thank you.

Congratulations, I am soon retiring too,it's a journey that challenges you everyday, good luck.

0:20 Every tract home in my town is plumbed like this, the left being from the kitchen and the right coming from the washer in the garage. Every house has problems and all have back ups in both. Plus a 1/2 inch ONLY drop in 40 ft. of line. LOL My job, inform and replace for money. Tract homes will keep plumbers busy for years to come.

very nice vide. the descriptions of why it is you cannot use the sanitary tee will help people remember.

Highly precious material, in most condensed, best-presented format. Congratulation to put such great content in such a short and valuable clip. All, please value and do the least, LIKE this clip and subscribe.

greetings from Indonesia, very useful. Thank you

I really appreciate this. Thank you

Great video thanks. Very helpful!

Thank you man !!!

Thanks! I was able to use this information when I plumbed my brother's bathroom. I put up a video to show how I was able to DIY with confidence now that I know how NOT to do it.

Do I need a vent or wet wall directly behind the closet flange? And can I tie in a shower drain to that same line and if so do I need a separate vent? Thank you

Waooooo super cool video!!! And very simple to understand 👏👍

Not all Codes. I'd suggest reading The National Standard Plumbing Code (IAPMO) 2.3.1a 2 Short radius fittings may be used in the drain piping of an individual fixture.

Excellent information! You sound so much like Owen Wilson. I love it.

Is it possible to plumb a whole house interior with schedule 80 (gray pipe) with all the various bends?!?! I saw a video of a high end home being built and they said it was being done there as more of a sound deadening material but I hadn’t heard of it before.... Thanks

We keep it real simple, no quarter bends or sanitary tees allowed on any job; even with venting.

And then there was the crew sent out by ServiceMaster that made up a drain line with a santee in the reverse direction! But at least they were consistent. They also hooked up the bathroom supply lines to the old, abandoned iron piping!

Nice video! Thanks for sharing

Always have a 45 degree angle dumping TOWARDS the drain flow to prevent blockages!

Thanks Owen Wilson!

Would this be the same for a drain to a leach field? I notice people are using the sanitary tee to save money instead of a distribution box

Thank You! Thank You !Thank You!

Hi Dylan. I am going to Austin for my test for tradesman. I am nervous. What do you recommend? Do you think ill pass?

how do you get hold of one of those code books for S.C ?

Thank you sir.Thumbs up for your videos..👍God bless.

Had a leak coming down my wall from the upstairs bathroom, in which I found a puddle on the floor that I blamed my dog for at first. The bubbling paint on the wall confirmed along with the wetness, that it wasn't my dog. Someone called a "plumber"! Alright a pro. Some pro, the plumber made Niagara falls come from my ceiling, down my walls, water dripping from my window seal. The toilet's bowl nuts weren't secured properly, I checked before the plumber got here. He must of lifted the toilet bowl without emptying the water. But the shower & sink drains where also plugged with the toilet not flushing. The plumber tried saying calcium build up, the shut-off valve didn't work, you need a new toilet! That was a late 6 p.m. on a Friday night call. Plumber said to call him Monday to install new toilet & whatever B.S. he thinks he's going to pull over on us after not bothering to clean up the water show he left us with to clean up & a non working toilet. Wtf