Thanks, I found the CPVC connectors that you are talking about. I also found the instructions in the Raypak install manual on making the water connections. It says the CPVC threads directly into the cast iron header flange. What I can't figure out is how the CPVC connector threads into the cast iron header flange. The cast iron header flange has female thread and the CPVC connectors also appear to have female threads. I'm not seeing how they connect. Maybe you thread the CPVC connector into the cast iron flange and it just cuts the threads into the CPVC as you thread it in?