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I have a toilet with an R&T fill valve, unknown model. The top of the fill valve is leaking out spurts of water making a hissing sound. I'd like to clean it by opening it.

So far I was able to remove the top blue cap and horizontal pin. The difficult parts trying to remove this white cap with the two parallel lines. I used this previous DIY stack exchange post's instructions:

Take a pair of standard (not needlenose) pliers and grip the two raised walls that contained the adjustment arm, push down into the shaft and turn. This unlocks the top of the mechanism so you can just remove it.

When I rotate this white cap counter-clockwise, the whole valve rotates with the cap. The cap does not loosen. Not sure what else to try. Anyone familiar with this?

Thank you.

enter image description here

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  • I have one that's similar, I press down (like a pill bottle) and rotate counter-clockwise. I wonder if the bottom of your toilet is now leaking if the shaft is spinning too.
    – Matthew
    Jul 24, 2023 at 17:11
  • It may be that it just needs a lot of force? The bottom part is not leaking which is good. Jul 25, 2023 at 14:02
  • These are often replaced rather than being repaired...
    – keshlam
    May 22 at 1:44

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Hold the bottom part firmly and use pliers to grab the top between the two plastic pieces that stick up. Push down kind of hard and turn the white part counter clockwise about a quarter of a turn. The pull it up

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