Ideal Standard SV70367 Pneumatic Flush Valve Diaphragm Bellows Washer, Black

Conceala two pump service kit is complete with two SV70367 flush valve bellows from Ideal Standard and is compatible with a variety of Ideal Standard flush valves. If your Ideal Standard pneumatic flush valve isn't flushing properly, it could very well be that not enough pressure is being generated to lift the flushing assembly of the valve. Quite often it can be this bellows washer, over time the washer may develop small fractures in it's surface as it's constantly expanding and contracting, therefore not keeping the air contained and not expanding enough to lift the flush valve assembly. You can test if it's the bellows washer yourself with a simple method. Simply disconnect the pneumatic tube that it attached to your push button and blow down the tube. If the valve doesn't lift properly as you're blowing down it, it will more than likely be this bellows washer. If the valve lifts with ease, it could very well be an issue with the button instead.