Source pneumatic barrel pump/oil pump/drum pump on m.alibaba.com
Lubeworks 3:1 Air Operated Oil Pump for 13-16 Gallon Pails - 28.7 in. Suction Tube - John M. Ellsworth Co. Inc.
Amazon.com: AlphaWorks Oil Transfer Pump Drum Air Operated Pneumatic 7.4GPM / 28LPM Elite Heavy Duty Double Action 3:1 Fast High Flow Rate for SAE130 Oils/Fluids (NOT for Gasoline or Diesel) : Automotive
National-Spencer 1714 3:1 Oil Pump for 55 Gallon Drum NS1714
5:1 Ratio Pneumatic Pump Fits 55 Gallon Drum For Oil, Gear Oil, Atf An
Macnaught's 3:1 Mobile Oil Dispensing Kit - 13-16 Gallon | Macnaught USA