WHK 1/2 PEX plug end cap is always use ECO-friendly material: Lead Free DZR brass which can protect portable drinking is safety and health.The pushfit caps is simplify your plumbing works and great save time and easiest to install on your plumbing pipe within seconds :such as Copper,PEX,CPVC,PE-RT, SDR-9 HDPE(used for 1/2 inch Copper cap,1/2"CPVC end cap,1/2 inch PEX end plug,push-to-connect end caps), this plumbing cap is corrosion free and is perfect for plugging the end of a pipe quickly and easily.The design of push-to-connect caps is use push way into plumbing pipe,it can rotate and fixed in tight spaces be installed wet lines,No need any special tools,glue,crimping or solidering for installtion.These Pex end caps passed by Certified & Compliant CUPC, ANSI/NSF-61, NSF-372, NSF-14, ASSE1061,it has applied for underground and behind-the-wall applications with no access panels.the brass push-fit end caps can bear temperture from 200 degrees F to 200 PSI.The Package including 12PCS pex caps 1/2 inch+1 PC 1/2" Disconnect Clip Tool.