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Owing to the way Siamp inlet mechanisms work, the symptoms of a cracked diaphragm can be misleading. On conventional compression washer (ball valve) mechanisms, a split washer lets water leak through all the time but with these, it can stop water flowing altogether. The shut off is achieved by the float sealing a tiny air hole just behind the diaphragm. Fitting one of these washers fixes almost all problems, even if the old one doesn't look to be damaged. Be very careful to fit it the right way around, the strut in the hard plastic fits in the slot on the inlet mechanism and the raised bump on the edge of the washer housing must engage in it's slot before the screw cover is refitted.
Verified purchase: Yes | Condition: New
Don’t buy this. Will fit but does not seal! Rubber is not thick enough to make a seal. I’ve ordered a complete valve unit, fingers crossed
Verified purchase: Yes | Condition: New
I was a bit doubtful about this washer seal based on all the reviews of other similar products on eBay, but it worked perfectly and was delivered promptly too.
Verified purchase: Yes | Condition: New
If your loo has a Siamp cistern fill mechanism and it won’t fill properly or won’t stop filling, chances are it is this little rubber diaphragm that has failed - even a tiny hole from it being slightly perished or worn will stop the cistern working properly. Two minute job to swap out - just line up new one perfectly - and toilet is back to working as new.
Verified purchase: Yes | Condition: New
cistern fill was slow and spayed water rather than fill cistern quickly, replaced this washer seal, which took about 5 mins, and all working well again, quick and easy fix.
Verified purchase: Yes | Condition: New
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