Feature: 1. Easy & Widely Use-- Operate filling for non-corrosive and non-thick liquids. Worked with the 50-gallon barrels and other opening containers. With pneumatic operation for higher speed extraction. 2. To Fill Steadily-- With the fluid outlet and control valve which can control the fluid to fill steadily. 3. Control Operating Pressure Easily-- With pressure regulator to control the operating pressure more easily and conveniently. 4. Reduce The Noise-- Piston designed for low noise and stable operation and the noise reduction nut for quieter working environment. 5. Multiple Applications Use-- 50-gallon barrel for filling diesel oil, pumping CNC oil or machinery oil out of the opening containers, and so on.