Have Bought this membrane and sent it back for replacement. The replacement was bad too. In both cases, the check valve was not working properly (this is a valve built into the diaphragm that blocks flow when the tank is full). In fact, pieces of the check valve literally fell out of the first diaphragm when I removed it to send it back to Revain. I installed the replacement diaphragm sent by Revain and it worked on the initial setup and after flushing the first 3 gallons as recommended it never stopped working. When I turn off the water supply, the 3-gallon tank empties, which Watts customer service says is a sign that the check valve isn't working. I'm bringing it back again and just going with a brand new system now. Revain will not send a replacement a second time and I'm not sure I can get a working replacement.
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