Jabsco Par-Max HD Heavy-Duty Freshwater Pump — 12V, 5.0 GPM, Cast Aluminum Housing (P501J-118-S3A)
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Jabsco Par-Max HD Heavy-Duty Freshwater Pump — 12V, 5.0 GPM
High-output freshwater pressure for larger boats and demanding multi-fixture systems. The Jabsco Par-Max HD P501J-118-S3A delivers 5.0 GPM at 12V with a heavy-duty motor and cast aluminum lower housing — built to run reliably at high pressures and high demand levels where the standard Par-Max series would be pushed beyond its design limits. The co-molded diaphragm, integrated bypass module, and sealed pressure switch deliver smooth, on-demand operation, and the Quick Connect Strainer is included. Self-priming, run-dry safe, and quiet thanks to vibration-dampening mounting feet.
Note: This is a pressure switch variant of the Par-Max HD 5 GPM platform. Confirm the correct pressure switch specification for your system before ordering — see also the P501J-115-S3A variant if you need a different switch setting.
Key Features
- 5.0 GPM flow rate at 12V DC — high output for multi-fixture and high-demand installations
- Heavy-duty motor and cast aluminum lower housing — built for long life at high pressures and continuous demand
- Integrated bypass module — reduces pump cycling and provides smoother flow
- Quick Connect Strainer included — protects pump from supply line debris
- Co-molded diaphragm technology for long service life and durability
- Integrated, sealed pressure switch for automatic on-demand operation
- Quick-connect ports for fast installation, servicing, and maintenance
- Vibration-dampening mounting feet for quiet operation
- Self-priming — flexible installation without manual priming
- Run-dry capable — no damage if the tank runs empty
Compatible Applications
- Multi-fixture freshwater systems on larger powerboats, sailboats, and cruisers
- Three or more simultaneous fixtures requiring strong, consistent pressure
- High-pressure freshwater systems where the standard Par-Max series is insufficient
- 12V DC installations requiring a heavy-duty pump with cast aluminum construction
Parts Desk Insights
The Par-Max HD 5 GPM is the right pump for mid-to-large cruisers with three or more fixtures and high-pressure demand. The cast aluminum lower housing and heavy-duty motor are the key upgrades over the standard Par-Max that allow it to handle continuous multi-fixture demand without wearing out prematurely. If you’re choosing between the two 5 GPM HD variants, confirm the pressure switch specification your system requires — the P501J-115-S3A is the companion variant. For the highest output in the HD lineup, the Jabsco Par-Max HD 6 GPM is the step-up. For lower flow in the HD series, the Par-Max HD 4 GPM and Par-Max HD 3 GPM are available. Add a GROCO PST-1 Accumulator Tank downstream for maximum pressure smoothing on high-output systems.
Part Number: P501J-118-S3A | Voltage: 12V DC | Flow Rate: 5.0 GPM | Housing: Cast Aluminum | Includes: Bypass Module & Quick Connect Strainer
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.