![CPVC adapter fittings](/ext/resources/PM/2014/September/products/PM0914_Products_pipe-joining_Uponor-ProPEX-Adapter-Fittings_300.jpg)
The ProPEX end of the fitting is manufactured with lead-free brass and is tested and listed to NSF 61 and NSF 372 to meet lead-free requirements. The CPVC end of the fitting is designed to transition from copper tube size pipe and fittings and is listed to the ASTM D2846 standard for CPVC fittings.