SEAFLO 12V 1.0GPM 40PSI Water Pressure Pump 21 Series Marine RV

Compact 12V automatic pressure pump

A small on-demand diaphragm pump for one or two low-flow fixtures on boats, caravans and RVs. It provides up to 1.0GPM at open flow and automatically stops when the water system reaches 40PSI.

Technical specifications

Applications and compatibility

• For a small galley tap, washbasin or compact water-transfer circuit on a 12V boat, caravan or RV.
• Manufacturer guidance identifies the 21 Series for one to two fixtures, but 1.0GPM is best treated as a low-demand supply.
• Check that appliances and plumbing accept a 40PSI cut-off setting.
• For clean compatible water only; never use with fuel, solvents or flammable liquids.

Installation and package contents

• Mount dry on a rigid ventilated surface with vibration isolation and access for servicing.
• Install a suitable inlet strainer and airtight suction line, matching the plumbing to the actual port fittings supplied.
• Use correctly rated cable and circuit protection based on the 4A maximum draw and cable length.
• Package contains one SEAFLO 21 Series pump. Connector options vary, so verify fittings and strainer before ordering.

Frequently asked questions

Will it run when a tap is opened?

Yes. Falling pressure activates the on-demand switch automatically.

Can it supply a shower?

Its 1.0GPM open-flow capacity is intended for low-demand use and may be insufficient for a conventional shower.

Does 40PSI mean it flows 1.0GPM at that pressure?

No. Flow is highest at zero pressure and falls as pressure rises.

Can it be connected to 24V?

No. This version is designed for 12V DC.