SharkBite's Copper Stub-Out Elbows are great for allowing plumbing lines to be roughed in. The SharkBite barb connection allows you to easily connect to your supply line for low cost. Once the drywall has been installed and painted, simply cut the Copper Stub-Out and attach the desired fitting to it in order to complete your installation. SharkBite barb fittings can be used in both a stainless steel clamp system, or a copper crimp ring system as well (each sold separately). ASTM F1807, NSF/ANSI 61, NSF 372.