The do work (try them), I just couldn’t be bothered to keep putting the valve in and out. Hope you found it helpful. I’m still learning how to make videos

You’re right, but I made the video to help people in a pinch

It was a chai tool lad

Thank you for reaching out. In most cases with tubes, removing the valve core isn't necessary, though it's always a good idea to check if they're tightly secured to prevent leaks. However, the practice becomes quite useful in certain situations. For instance, some cyclists prefer using Schrader valves for tubeless setups, which makes valve core removal handy for adding sealant and properly seating the tire. Additionally, this technique can be beneficial during suspension servicing as well.

Valve cores are like 25 cents, and you don't have to take off the wheel, tube and tire. Or free if you take them off dead-from-the-factory tubes. It's also a handy video for automotive tires if you want to let air out quickly hands-free.

sometimes the valves have grit which causes leaks, like in a centreal heating expansion tank

Hi @JohnGuytonJr-mn6ts, the principal is exactly the same if the value is on the rim or not. Obviously, I took the valve out to make it easier to show. Thanks