Grainger Approved, Solutions That Make a Difference 316 Stainless Steel Coupling The 316 stainless steel construction for this GRAINGER APPROVED coupling has a higher nickel content, as well as molybdenum, for better corrosion resistance. - Compatible with Schedule 80 stainless steel pipe - For use in air, water, and natural gas applications Pipe Fitting Material / 316 Stainless Steel Fitting Schedule/Class / Class 3000 Pipe Size - Pipe Fitting / 2-1/2 in Fitting Connection Type / FNPT Max. Pressure / 3000 psi @ 100 Degrees F Max. Steam Pressure / 2810 psi @ 350 Degrees F Outside Dia. / 3 5/8 in Standards / Threads conform to ASME B1.20.1 NPT; Materials conform to ASTM A182, Dimension conform to ASME B16.11