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Siamp diaphragm membrane washer, suits Siamp 99B, 95L and 95B toilet cistern float valves / ball-cocks.
These washers can fail with a little tear in the rubber part, which in turn makes the toilet cistern very slow to fill.
Check the diameter - This item measures 28mm over the rubber part and height from base to top of plastic insert is 15mm.
The picture below shows where the diaphragm washer is fitted :
excellent product, fitted in minutes with perfect resultsMM (25 Jul 2013, 15:31)