An adapter or adaptor is a device that converts attributes of one device or system to those of an otherwise incompatible device or system. Some modify power or signal attributes, while others merely adapt the physical form of one component to another. American National Standard Pipe Thread standards, often called National Pipe Thread NPT standards for short, are U.S. national technical standards for screw threads used on threaded pipes and pipe fittings. They include both tapered and straight thread series for various purposes including rigidity, pressuretight sealing, or both. The various types are each named with a symbol and a full name examples of the symbols include NPT, NPS, NPTF, NPSC, and others. Features. 0.75 NPT Female x 0.7514UN Male Adapter. Made with high quality materialSpecifications. Size 0.75 NPT Female x 0.7514UN