This 3/4"" Schedule 40 Coupling has double FPT ends, so it connects two male-threaded NPT connections. PVC couplings connect two fittings or lengths of piping in a straight line. This PVC fitting is often used to make connections in irrigation and swimming pool systems. This fitting is made from high-quality schedule 40 PVC. PTFE thread seal tape is recommended for a tight seal on threaded connections.