MODEL "764PD" PNEUMATIC DIFFERENTIAL PRESSURE CONTROLLER 3-15 PSIG OUTPUT,BRONZE CONTROL HOUSING (PNEU CIRCUIT), 1/4" NPT PNEUMATIC CONNECTION;; STANDARD WETTED CONSTRUCTION; IRON CASINGS, BE-CU DIAPHRAGM; 1-30 PSID DIFFERENTIAL PRESSURE RANGE; STANDARD 1/4" NPT PROCESS CONNECTION,CENTER OF UPPER DIAPH CASING;; STANDARD/COMMERCIAL PAINTING & CLEANING;