Specifications: Item:-Vacuum/Pressure Relief Valve(M)NPT Inlet (In.):-1Flow Capacity (CFM):-0 to 40Pressure Range (PSI):-0 to 20Vacuum Range (Inches Hg):-0 to 30Max. Temp. (F):-250Body Material:-BrassPoppet:-Brass Piston with O-Ring SealSeal Material:-NitrileSpring Material:-Stainless SteelHex (In.):-1-5/8Length (In.):-5-1/4Function:-Easily Convert from Vacuum to Pressure Relief by Reversing Poppet and SpringUNSPSC:-40141606