The 41-Series-Short is our 4-chamber diaphragm pump, providing up to 3.3 gallons per minute. This automatic water system pump is designed for boats and RVs with multiple fixture water systems. This automatic demand water system pump has a built-in pressure switch, which automatically starts and stops when the faucet is opened and closed. These models are designed to run on water systems with no accumulator tank necessary and is capable of supplying up to 3 fixtures. This pump is capable of self-priming up to 9 vertical feet, and can run dry without damage. They’re easy to install and service with quick-connect fittings.