The plastic drum pump is designed to fit 5, 10, 15, 30 and 55 gallon drums with 3/4″ and 2″ threaded openings, and also 2-5/8″ flexspout openings for 5-gallon pails. The extension tubes included can reach the bottom of a 55 gallon drum. The pump is adjustable to pump 2, 4, 6 or 8 oz per stroke. The plastic drum pump has a polypropylene exterior body and polyethylene internal parts. The pump can be used for pumping water, water-based liquids and detergents.