I am hoping to find the best replacement option for a corroding hot water valve on the supply line for the hot water heater tank. I suspect the reason for the corrosion are dissimilar metals reacting to each other (valve and pipe). The copper line is connected to an old-type plastic material pipe that was discontinued since 1995 (forgot the name) because it became brittle with time. Anyway to replace the valve without soldering? I do not want to melt the plastic PVC pipe. Thank you.