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12V Manual Pressure Pump -Jabsco 4 Litre Par-Max 1


Can handle pressure up to 35PSI with 4 LPM flow. Consistent water pressure to handle up to 2 taps or outlets at one time.

SKU: J20-098 Categories: , ,
Additional information

sco 4L Par-Max 1 manual pressure water pumps

The 12V manual pressure pump is a very reliable miniature multi-outlet water pressure pump that serves one or two 10mm (3/8″) 10mm outlets at any one time.

This Jabsco 12V manual pressure pump has no pressure switch, it needs to be turned on or off by a separate switch. The 42631-2900 is a manual demand pump for use with an electric faucet.

The 12V manual pressure pump is perfect for small boats, caravans and campervans.

  • 10mm (3/8”) barbed inlet and outlet – also supplied with 2 adaptor bushes to convert the inlet/outlet barbs to ½” 12mm barbs.
  • No Switch, 35 PSI Maximum
  • 3 LPM (1.1 GPM) at open flow
  • Self priming to 1.2m (4ft)
  • Can be run dry without damage
  • 2 chamber dual diaphragm operation
  • The thermal overload protection automatically stops the motor should it overheat due to overload. It has an auto restart feature
  • Pressure switch cut-in at 22 psi (1.5 bar), cut-out at 35 psi (2.4 bar)
  • Ignition Protection
  • Three-year warranty


A typical installation of a Jabsco Par-Max DC Pressure Pump

The Jabsco 12V Manual Pressure Pump comes with installation instructions included in the box. Please read and follow the instructions.

  • Model: 42631-2900
  • LPM: 4.3
  • Up to 50 psi / 3.5 bar
  • Max Amp Draw: 1.9 @ 10 PSI
  • Pump Fuse: 4 Amp
  • Cut in Pressure: 22 PSI/1.5 bar
  • Cut-out Pressure: 35 PSI/2.4 bar


Accessories (not included)

Accumulator Tanks

Jabsco accumulator tanks used in pressure pump systems

Accumulator tanks hold a reservoir of air and water down stream from the pump. The air acts as a cushion, absorbing pump and pressure fluctuations, smoothing the flow and making the system quieter. Accumulators allow the pump to reach shut-off pressure more smoothly which reduces the on/off cycle which gives better control of hot water delivery.
Our accumulator tanks all have a bladder that separates water from air. The bladder is pre-pressurised but may need fine tuning when installed to give the most efficient performance. One of the advantages of an accumulator tank is that they can dispense up to half of their capacity of water even when the pump is switched off. So the bigger the reservoir, the more water you have available without having to switch the pump on helping you wash your hands or clean your teeth without noise.


Jabsco Water Pressure Regulator

Water Pressure Regulators

Inlet water regulators are designed to protect your boat water system plumbing and fixtures from the possible high pressure of municipal water systems. Regulation is controlled at all flow rates by a pre-set spring and removable strainer traps debris. Both inline portable and permanent flush mount models are available in our new line of diaphragm sealed regulators.

Jabsco PumpGuard Strainer plug-in with half inch male thread


PumpGardTM Strainers
Inlet Strainers are an essential part of any fresh water system using a diaphragm pump – protecting the valves from small particles in the water. The Pumpgard is designed for easy installation and rapid filter screen cleaning. A transparent bowl screws off to allow simple, regular inspection.




3 Years