7" x 7" 316 stainless steel filter press by sperry filter press, size c 7, serial # x43253. Features 6-1" thick frames and 7-1. 250" thick plates with 3/8" top and bottom female npt ports, rated for 100 psi service, type 41 42, four eye, 1/2" polymer construction air operated diaphram feed pump by aro, press opens to 23. 5" opening for expansion with additional plates and frames from 14. 5" plate and frame bundle thickness allowing apx 9" of additional room, press is mounted on portable bishamon manually operated scissor lift table to 31" floor height at 550 lbs. Capacity. Formerly used in chemical service.