TruFLOW Supply/Return adapters come in Sweat, Threaded, and ProPEX. Copper Adapters: Use sweat adapters to transition R32 manifold union nut to 3/4", 1" and 1-1/4" copper pipe, copper fittings and valves. Threaded Adapters: Use threaded adapters to transition the R32 manifold union nut to PEX Tubing or MultiCor tubing with QS-style fittings. ProPEX Adapters: Use ProPEX adapters to transition from R32 manifold union nut to 1/4" and 1" PEX tubing. ProPEX Tool is required. Purchase ProPEX Rings separately.