Solid Brass 3/8" to 3/8" NPT Nipple Pipe Connection Allows you to join female-threaded pipe,connections or attachments; 3/8" nominal NPT pipe size Solid brass for rust and corrosion-free service with air, gas or water NPT threads provide excellent sealing characteristics when torqued Dimensions: internal diameter 7/16", thread OD 5/8", 11/16" nut; length 1-3/16"