1995 Kinney Rotary Piston Vacuum Pump. Model KT500-D. S/N: 95-0496 H6673-1. With a nominal displacement of 494 cfm., the KT500 can operate continuously (at any pressure) up to 100 Torr with a full pumping speed down to 1 Torr. Other features include: An adjustable gas ballast that permits handling of condensable vapors, no contact in pumping chamber between metals, compact footprint design and unequaled durability, even in dirty applications. A unique, triplex piston design provides quiet, vibration-free operation and installation is simple, with no special preparations required. Inlets: (1) 4 in. dia. NPT fitting. Outlets: (1) 4 in. dia. NPT reduced to 3 in. NPT (filter discharge). Overall dimensions: 3 ft. 11 in. L x 3 ft. 1 in. W x 5 ft. 6 in. H. (ACN361).