Stainless Steel 304 Cast Pipe Fitting, Full Coupling, MSS SP-114, 1/4" NPT Female Coupling for connecting and extending pipes going in the same direction Female National Pipe Taper (NPT) threads for connecting to male pipes Made of stainless steel 304 for strength Low carbon content for resistance to corrosion Conforms to standards MSS SP-114, ANSI B1.20.1, and ASTM A351, for quality assurance