CTS (copper tube size) brass SharkBiteREG tail adapter service line tee for domestic water supply systems. Easy, quick push-fit connection for water distribution pipe, copper, CTS (copper tube size), CPVC (Chlorinated Polyvinyl Chloride), and PEX (cross-linked polyethylene). No tools required to connect. NSF 61 (National Sanitation Foundation) specification. Manufactured to include no more than 0.25% weighted average lead content on wetted surfaces.