SHURflo Aqua King II Freshwater Pump — 3.0 GPM, 55 PSI (4138-131-E65)
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
SHURflo Aqua King II Freshwater Pump — 3.0 GPM, 55 PSI
A high-pressure freshwater pump for multi-fixture marine installations where consistent, strong water pressure is the priority. The SHURflo Aqua King II 4138-131-E65 delivers 3.0 GPM at 55 PSI — enough flow and pressure for two or more fixtures running simultaneously. The four-chamber diaphragm design eliminates rapid cycling and pressure pulsing for smooth, steady flow at all demand levels. The sealed E-coated housing is built specifically for the marine environment, and the pump is dry self-priming up to 6 feet and run-dry safe. A direct replacement for the Aqua King 3901 series with the same mounting bracket.
Note: Verify voltage requirements for your installation before ordering — confirm this model’s voltage specification matches your system. Contact us if you need assistance selecting the correct variant.
Key Features
- 3.0 GPM flow rate at 55 PSI — strong pressure for multi-fixture installations
- Four-chamber diaphragm design — smooth, steady flow with no rapid cycling or pressure pulsing
- Dry self-priming up to 6 ft — no need to prime before startup
- Run-dry capable — no damage if the tank runs empty
- Sealed motor and pressure switch in a seamless E-coated housing for long-term marine durability
- Ignition protected with thermal breaker
- Includes swivel straight adapter fittings: 1/2"-14 NPT × 1/2" barb (qty. 2)
- Direct replacement for Aqua King 3901 series (same mounting bracket)
Compatible Applications
- Multi-fixture freshwater pressure systems (galley + head, or two simultaneous taps)
- Powerboats, sailboats, and cruisers requiring strong, consistent water pressure
- Freshwater systems requiring ignition-protected pumps
- Direct replacement for SHURflo Aqua King 3901 series installations
Parts Desk Insights
The 4138-131-E65 is a variant of the Aqua King II 3.0 GPM / 55 PSI platform — confirm the voltage specification for your system before ordering to ensure you’re selecting the correct model for your installation. For the standard 12V version of this pump, see the SHURflo Aqua King II 3.0 GPM / 55 PSI (4138-111-E65). For lower flow and power draw, the SHURflo Aqua King II 2.0 GPM / 30 PSI is the step-down option. For higher output, the SHURflo Aqua King II 4.0 GPM and SHURflo Aqua King II Supreme 5.0 GPM are the step-up models. Pair with the SHURflo 65 PSI Wall-Mount Pressure Regulator when connecting to shore water.
Part Number: 4138-131-E65 | Flow Rate: 3.0 GPM | Pressure: 55 PSI | Dimensions: 8-1/8" × 5" × 4-1/8"
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.