Directly from One of the Biggest Pex Systems Manufacturers 5 Pieces Pex A Full Flow Expansion Brass Fittings 1/2" Plug (End Cap) with Protection Cap Compatible with all Types of Brands of Pex A Pipe/Tubing, Compatible with Expansion Fitting System, NOT Compatible with Stainless Steel Clamp & Copper Crimp Ring Systems Certified to ANSI/NSF-61 and ASSE 1061 Product Standard. Meet the Standard F1960; Need to Order Expander Tool + Pex Sleeves / Ring Separately; Only for Pex A Pipe/Tubing Fitting Expansion Style Connection