I have a problem with my double flush valve in the toilet tank. Installed it looks like this: inside the cistern, showing the flush valve

Now the problem is, when pushing either of the two buttons, or both together, the water in the tank doesn't release to flush the toilet.I got the centre piece out:

bottom of disassembled flush valve

I realized that the disk with the grey rubber ring, just falls off the centre piece that lifts up when the buttons are pushed on top. I imagine it should pull up the disk to release the water but it doesn't stick on there, it just pops right off.

I got it somewhat reassembled, but with a little vibration it falls right off, it just holds on there by friction.

reassembled flush valve

It seems like some thing that holds it up may be missing...? Any hints? The assembly looks to be the same as this one from WaterMark: https://www.alibaba.com/product-detail/Watermark-Upc-Toilet-Htd-New-Wra_60870640816.html

  • 1
    Are there any brand/model number markings on the valve? If so, sharing that would go a long way toward allowing someone to look up the instructions to see how it should be assembled and if something is broken/missing. Did you look in the bottom of the tank to see if there were any stray parts hanging out down there?
    – FreeMan
    Apr 5, 2022 at 16:44
  • It's a WarerMark type of assembly, I've added a link to a model that looks to be the same above
    – stdcerr
    Apr 6, 2022 at 15:02

1 Answer 1


I'd have to say yes, replace it. A "T" that the bottom diaphragm clips onto or receives is missing. But, you could try drilling through (aligned with the wide ribbed legs) while assembled and put a screw or piece of a screw (stainless steel) through to hold the diaphragm on.

  • Frankly, while a replacement would probably cost more than a cup of coffee, it's probably not worth the time, effort or hassle of trying to bodge a repair if parts are missing or broken.
    – FreeMan
    Apr 6, 2022 at 15:13

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