Fluidyne pneumatic barrel pump or air operated barrel pump fits drums with 44mm or 50mm diameter openings and will efficiently transfer of oil and other corrosive or non-corrosive fluids. The pump suction tube is 40 in. long and is suitable for standard drum or carboy. Fluidyne pneumatic barrel pump or air operated barrel pump works on air pressure of about 100 psi. Fluidyne pneumatic barrel pump or air operated barrel pump is ideal for combustible liquids and construction is flame proof.