Type: two ends female NPT threads, union for connecting and extending two male pipes. · Cast pipe fitting size Pipe union fittings are components used for connecting, terminating, controlling flow, and changing the direction of pipe. Fittings are available threaded or unthreaded, in many shapes, styles, sizes, and schedules (pipe wall thickness) It is suitable for copper, brass, aluminum, and steel tubing. 1/2 Inch Female NPT Union Stainless Steel 2" Female NPT Hex Union Cast Pipe Fitting Adapter Fuel Plumbing Gas Refrigeration Fitting Cast Pipe Fitting Hex Bushing 3/4 NPT Male X 1/2 NPT Female Stainless Steel Reducing Adapter... Type: two ends female NPT threads, union for connecting and extending two male pipes. This Beduan pipe fitting has tubing connectors. Tub To Shower Adapter Beduan 1/2 Stainless Steel Pipe Extension Adapter - 30mm To 100mm Lengths For Shower & Tub Spout 1/2 Inch Plumbing Fittings Cast pipe fitting size: 1/2 NPT Female