1/2 Expansion Pex A by 1/2 Female Pipe Thread (FIP) Swivel Elbow. Lead Free Brass. For use with cold expansion Pex A pipe and sleeve system. Compatible with Uponor (Wirsbo) ProPEX™ piping systems (ProPEX® is a trademark of Uponor). ASTM F1960. Single Pa Increased FlowFull flow for maximum water outputDesigned exclusively for use with Pex A piping systems in potable water systems to control flow of water to all fixtures