Large pump provides 22 oz. per stroke and fits 15, 30, and 55 gallon drums with 1/2" or 2" openings. Pump is not to be used with acids or flammable or explosive chemicals. Use for soaps, detergents, liquid waxes, light oils, light oils, cutting fluids, anti-freeze and cleaning solutions. Nickel-chrome finish. Not UL approved. 91033 has 3/4" OD discharge.