MODEL "HP-1+6+S" DIFF. PRESS REDUCING REGULATOR FOR NACE SERVICE 1" SIZE; WCB BODY & SPRING CHAMBER; SPECIAL TRIM MATERIAL; OPT-30: 600 LB RAISED FACE FLANGES; SPECIAL RANGE SPRING; PER SPQ NUMBER 53010 316SST CYLINDER,316SST PLUG WITH TFE SEAT,NEOPRENE ELASTOMER DIAPHRAGM; 5-40 PSID RANGE SPRING;