Brass Instrumentation-Grade FittingsMachined to an exceptional tolerance level, with rolled threads for increased strength. NPT connections. For instrument air, gas, and liquid service.Meet ANSI B31.1, B31.3, and B1.20.1 standards. Reducing Male Hex Nipple, Pipe Fitting Material Brass, Pipe Size - Pipe Fitting 3/8 In. x 1/4 In., Fitting Connection Type MNPT, Standards ANSI B31.1, ANSI B31.3, ANSI B1.20.1, Fitting Length 1-29/64 In., Max. Pressure 4000 psi, Hex Size 3/4 In.