MODEL "123-1+6+S" DIFF BACK PRESS RELIEF REGULATOR,NON-NACE SERVICE 1" SIZE,3/4" FULL ORIFICE; WCB BODY & SPRING CHAMBER; SPECIAL TRIM MATERIAL; SPECIAL END CONNECTION; 30-80 PSID RANGE SPRING; PER SPQ NUMBER 50894 W/ PE NIPPLE END CONNECTIONS (-32 OPT); 316 SST METAL SEATED TRIM W/ BUNA-N DIAPHRAGM & SEALS; BUILD & TEST PER MA# 32935;