Is the screw hole is a through hole, to prevent leakage from the screw, need to seal, this seal gasket dimensions with the pad, screw is M8. Who sells it? It's better to send a sample link.
Use a combination pad; the outside is iron. Inside is similar to the O ring soft plastic, mounted in it, you can go to the hardware store to see.
Use a combination pad; the outside is iron. Inside is similar to the O ring soft plastic, mounted in it, you can go to the hardware store to see.
Copper gasket can be used to seal
