Can I just get some wet and dry on the cones to neaten them up if there's a ridge? Ot are they unrepairable?Generally a diaphragm failure causes problems with the system not filling the tank. My guess is it's probably ok.
Also if the NRV cones have any wear, find the best one and use that for NRV-1. The other two only impact operation if the solenoid valves are leaking.
Also which one is NRV1!
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