Husky 515 55 gal (208 liter) AC Transfer Pump Package with SS Drum Cover, Heavy-Duty Agitator & Drum Cover ElevatorThe Husky 515 air operated double diaphragm pump features a stall free low pulsation air valve which provides a smooth and rapid changeover. The bolt through fluid cover design eliminates leaks and makes the Husky safer with higher reliability. Center and end porting options. No mechanical seals to cause fluid leaks or failures Runs quietly at less than 85 dBa with easy to use remote muffler capability for even lower noise levels Easy to service air