Pressure Regulating Valve, 2 Way, Flange, Connection Size (In.) 2-1/2, Port (In.) 2 1/2 in, Design Pressure (PSIG) 320 psig, Set Points 160 to 260, Application Head Pressure Control with Non-Corrosive Refrigerants, For Use With Non Corrosive Refrigerants, STT18A-601R, SEP81A-601R