My petcock leaked thru the handle so bought a replacement inner gasket thinking it might be the only replaceable part. The kit came with two screws to replace the rivets. I drilled out the rivets before realizing I used a larger diameter bit than the kit screws came with. Cut off the rivet heads and disassembled the petcock–here’s what to see.
The rotating positioning piece of the petcock contacts the gasket and directs flow from the main or reserve pipe, or to a blocked position for OFF. I’ve cleaned up the parts but also noticed a grooved oring on the positioned I hope this doesn’t become a problem. Also the new gasket is a smaller diameter than the old one.
