Home Improvement Stack Exchange is a question and answer site for contractors and serious DIYers. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I'm trying to replace the fill valve of a toilet that's missing some parts and I've run into a snag. I bought a Fluidmaster universal fill valve, and the instructions say that the top of the overflow tube should be at least an inch below a certain level on the new fill valve assembly. But the fill valve seems a bit short, and the overflow tube is higher than allowed. Here's a picture:

Inside the tank

It's kind of hard to see because of the angle, but hopefully it's visible how the overflow tube is almost as high as the new fill valve, and certainly higher than the fill valve's "critical level" indicator.

I could cut an inch or two off the top of the tube, but then presumably the water level in the tank will be lower. This is a low-flow toilet so I'm worried that it simply might not flush properly if I let the water level fall. Should I cut the tube anyway and not worry about the lower water level?

If I should just cut the tube, what's the best way to do this? The space inside the tank is really awkward and none of my saws fit. I can get my PVC pipe cutter in there but the tube material is a bendy plastic so it just compresses when the blade hits it.

share|improve this question
A picture would be helpful. Is the fill valve height adjustable? – Tester101 Feb 8 '14 at 3:07
Thanks; I've added a picture. – iLikeDirt Feb 8 '14 at 4:55
up vote 3 down vote accepted

I think @Tester101 has asked the pertinent question, is the fill valve height adjustable. It is. You need to adjust it's height as shown below:

enter image description here

share|improve this answer
D'oh! Somehow I managed to read that part of the instructions without figuring out that the whole valve assembly was adjustable. That's done it; thanks guys! – iLikeDirt Feb 8 '14 at 5:22

I have the same situation because the instructions say the top of the new fill valve should be 3" above the overflow tube and in my tank that would place the top of the fill valve above the top of the tank so I plan to take 1" off the overflow tube

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.