Vilter 8-Cylinder Reciprocating Compressor. Model: 458. Refrigerant: last used with R-717 (ammonia). Displacement: 398 cfm. Max speed: 1,200 rpm. Max discharge pressure: 350 psig. Max discharge temperature: 300˚F. Water-cooled heads. Westinghouse motor, 100 hp, 1180 rpm, 230/460 V, 232/116 amps, 60 Hz, 3 phase. Inlet: (1) 5 in. dia. suction port. Outlets: (1) 4 in. dia. discharge port. Overall dimensions: 7 ft. 8 in. L x 3 ft. 4 in. W x 4 ft 2 in. H. (H12)(ACN329a-BC/Motor)