The stub out elbow with wall made of durable copper comes in a variety of lengths and inlet connections. Measuring 3/4" x 4" x 8" they are mainly used when installing PEX pipe for plumbing applications and stub out the wall for further connections of outlet stop valves and plumbing fixtures. With the barb connection, the stub out copper elbows go to toilets, sinks, showers and drains including pipes that vent to the roof. The copper stub out must be in place and tested before the walls are added. Spin-closed outlet for pressure testing purposes prevents dirt and debris from entering the pipes during construction. Fittings works with crimp ring or clamp connection methods. The drop ear (nailing plate) allows to secure stub-out to wooden or metal surfaces. Meets UPC, IPC and cUPC requirements and NSF listed.