MODEL "123-1+6+S" DIFF BACK PRESS RELIEF REGULATOR,NON-NACE SERVICE 1" SIZE,3/4" FULL ORIFICE; SPECIAL BODY & SPRING CHAMBER MATERIAL; S40S TRIM: 316SST METAL SEAT,FLUOROCARBON ELASTOMER (FKM) DIAPHRAGM; SPECIAL END CONNECTION; 165-350 PSID RANGE SPRING; PER SPQ NUMBER 55834 PER SPQ: 316L CF8M SST BODY AND SPRING CHAMBER; SPECIAL 300# RF FLANGES; 30-150 PSID RANGE SPRING; INLET RATING: 720 PSIG CWP 515/400F; OUTLET RATING: 720 PSIG CWP 515/400F;