31-Series Diaphragm Water Pump 115V 120 PSI

SEAFLO 31-Series Diaphragm Water Pump 115V 120 PSI

The SEAFLO 31-Series is a continuous-duty, on-demand positive displacement pump built for moderate water flow and high-pressure applications. This 3-chamber diaphragm pump delivers up to 1.8 gallons per minute and achieves a 120 PSI shut-off pressure, making it well-suited for RV water systems, marine installations, agricultural sprayers, industrial equipment, and high-pressure cleaning setups. Operating at 115V AC, it provides reliable performance wherever a dependable pressurized water supply is needed.

The pump is self-priming up to 6 vertical feet, allowing flexible placement in relation to the water source. Its run-dry safe design protects the motor and diaphragm from damage when the water supply runs low or is temporarily interrupted, reducing maintenance concerns and extending service life. A built-in automatic pressure switch starts and stops the pump on demand — when a fixture is opened the pump activates, and when it is closed the pump shuts off — providing efficient and seamless water delivery.

Constructed with EPDM valves and a Santoprene diaphragm, the 31-Series withstands tough operating conditions in marine, agricultural, and industrial environments. The pump features an industry-standard mounting pattern for straightforward installation and 3/8"-18 FNPT inlet and outlet ports for compatibility with common fittings. Built-in thermal protection guards against overheating, and the low-noise, low-vibration design ensures minimal disruption in residential and mobile applications.

Key Features

• Continuous-duty, on-demand positive displacement 3-chamber diaphragm pump
• 115V AC operation at 120 PSI shut-off pressure
• Flow rate up to 1.8 GPM (7.0 LPM)
• Self-priming up to 6 feet (1.8 m) suction lift
• Run-dry safe — no damage when operating without water
• Built-in automatic pressure switch starts and stops on demand
• EPDM valves and Santoprene diaphragm for durability
• Built-in thermal protection
• Industry-standard mounting pattern for easy installation
• 3/8"-18 FNPT inlet and outlet ports
• Quiet, low-vibration operation
• Suitable for RV, marine, agricultural, automotive, and industrial applications
• 4-year warranty