The 53-Series is our Heaviest-Duty diaphragm water pump. It provides high volume water flow with reduced pump cycling, thanks to the large five-chamber diaphragm. Quick Attach Fittings make installation or replacement easy. These models are designed to run on water systems with no accumulator tank necessary, and up to five fixtures! Due to it's robust motor and heavy-duty construction, it's a popular choice for use with tough agricultural applications. It provides up to 7.0 gallons per minute! The 53-Series pumps are self-priming, and can run dry withour damage. This automatic demand water pump has a built-in pressure switch, which automatically starts and stops the pump when the faucet is opened and closed. They are easy to install, service and winterize.