I chewed into the 3/8" ID plastic fresh water pipe w/a hole saw so I need to repair w/a union. Does anyone know what material this is? Valves are Qest. I find tubing of this type as PEX, polybutylene, cpvc, etc. I think the PEX fittings are simple. From what I can tell, you need to buy 1/2 a plumbing shop for polybutylene. I'm thinking the PEX is going to work, but I am not sure what is in the boat?Also I have found several sources on-line, but does anyone have a good one w/decent advice?