Balcrank 50:1 Panther Grease Pump for 400 lb. containers is ideal for medium usage applications. The pump is bare, with no connecting hoses, and features a double-acting pump ratio and balanced flow displacement, as well as enlarged flow passages and high-performance check valves. This unit easily handles thicker viscocity greases and includes a heavy-duty, large displacement air motor with a long stroke design. The unit offers a quiet operation, and the positive detent air motor prevents stalling between strokes. This patented Panther HP Pump delivers up to 3.5 lb./min. and offers a 50:1 pressure ratio, 3.25 stroke, and operating air pressure range of 40-150 PSI.