Jabsco — PAR-MAX 3 Fresh Water Pump, 12V, 3 GPM, 40 PSI — 31395-4012-3A
In stock items ship same or next day.
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
Jabsco PAR-MAX 3 Fresh Water Pump — 12V, 3 GPM, 40 PSI
The Jabsco 31395-4012-3A PAR-MAX 3 is an automatic 12V DC pressure pump for onboard fresh-water systems. Its three-chamber diaphragm design supplies up to 3.0 GPM (11.3 LPM) open flow and shuts off at 40 PSI (2.8 bar), helping maintain steady pressure at sinks, faucets, showers, and similar fixtures.
Key Features
- Three-chamber diaphragm pump with integrated pressure switch and internal bypass
- Self-priming up to 10 ft (3 m)
- Can run dry without damage
- Enclosed permanent-magnet motor with thermal protection
- Maximum current draw: 6 A at 40 PSI
- Recommended fuse: 10 A
- IPX6 rated and ISO 8846 ignition protected
- Intermittent-duty operation
Compatible Applications
- 12V DC marine pressurized fresh-water systems
- Onboard sinks and faucets
- Marine showers and similar domestic-water outlets
Confirm that the vessel uses a 12V DC electrical system and that 3 GPM at 40 PSI suits the plumbing layout. PAR-MAX 3 pumps are also offered in other voltage and pressure configurations, so match the complete 31395-4012-3A part number.
Part Details
- Brand: Jabsco
- Series: PAR-MAX 3
- Part number: 31395-4012-3A
- Product type: Marine fresh-water pressure pump
- Voltage: 12V DC
- Operating voltage range: 9–13.6V DC
- Open flow: 3.0 GPM (11.3 LPM)
- Pressure-switch cut-off: 40 PSI (2.8 bar)
- Fluid temperature range: 32°F to 140°F (0°C to 60°C)
- Approximate dimensions: 9.1 × 4.2 × 4.2 in (231 × 108 × 106 mm)
- UPC: 671880841801
Included Components
- Two 1/2 in (13 mm) straight hose-barb fittings
- Inline quick-connect 40-mesh strainer
- Installation and operation manual
Installation Notes
Mount the pump in a dry, accessible location using its vibration-isolating feet. Allow clearance for the quick-connect port clips, hose fittings, and 12 in (305 mm) 16 AWG (1.5 mm²) electrical leads. Before replacing an existing pump, inspect the inlet strainer, tank supply, hoses, and connections for restrictions or air leaks.
Replaces
- Jabsco 31395-0092
- Jabsco 31395-0392
Technical FAQ
Why does the pump cycle frequently?
First confirm that the plumbing is leak-free, the inlet strainer is clear, and no connection is drawing air. Also verify that the electrical supply can maintain the required voltage and current.
Can this pump run dry?
Yes. The diaphragm design is run-dry capable, but the inlet supply and strainer should still be checked if the pump is not moving water.
Will any PAR-MAX 3 replace this model?
No. Match the complete part number, voltage, flow, and pressure rating because similar-looking PAR-MAX 3 versions can operate differently.
Parts Desk Insights
Best use case: A strong match for a 12V marine fresh-water system needing automatic pressure for several common onboard fixtures.
Most common mistake: Choosing a similar PAR-MAX 3 by appearance alone. Check for 12V, 3 GPM, 40 PSI, and part number 31395-4012-3A.
Sizing and fitment: Confirm the pump capacity suits the number of fixtures, allow room around the quick-connect ports, and verify the existing wiring and fuse are suitable for a 6 A maximum draw and 10 A recommended fuse.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.