5 gpm siphon pump. Features bellow action for quick and easy emptying of 15-30 and 55 gallon barrels. 4 ft discharge hose included 2"bungDrum Pump, Siphon, 500 SSU, Outlet Size 3/4 Inch Outside Diameter, Suction Design Tube, Suction Pipe Size Outside Diameter 7/8 In, Adapter Type 2 Inch NPT Bung, Fits 15, 30 and 55 Gallon Drums, Piston Polyethylene, Pump Body Material Polyethylene, Max Temp 140 Degree F, Includes Discharge Tubing, GPM 5, Discharge Tubing Material Corrugated Flexible Polyethylene, Internal Parts Material Polyethylene, Overall Length 43 1/2 In, Self Priming, Suction Tube 34 Inches Long