SHURflo Aqua King II Freshwater Pump — 12V, 3.0 GPM, 55 PSI (4138-111-E65)
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SHURflo Aqua King II Freshwater Pump — 12V, 3.0 GPM, 55 PSI
A step up in both flow and pressure for boats with more demanding freshwater needs. The SHURflo Aqua King II 4138-111-E65 delivers 3.0 GPM at 55 PSI — higher pressure than the entry-level 2.0 GPM model, making it a better fit for multi-fixture installations or boats where strong, consistent water pressure at the tap matters. The four-chamber diaphragm design eliminates rapid cycling and pressure pulsing, the sealed E-coated housing is built 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.
Key Features
- 3.0 GPM flow rate at 55 PSI — strong pressure for multi-fixture or higher-demand 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
- 12V DC operation
- 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 higher pressure than entry-level pumps provide
- 12V DC freshwater systems requiring ignition-protected pumps
- Direct replacement for SHURflo Aqua King 3901 series installations
Parts Desk Insights
The 3.0 GPM / 55 PSI model is the sweet spot for most mid-size cruising boats — enough flow for two fixtures running simultaneously and enough pressure to feel like a proper household tap rather than a trickle. If you only have one fixture and want to keep power draw low, the SHURflo Aqua King II 2.0 GPM / 30 PSI is the step-down option. For higher flow on larger boats with three or more fixtures, the SHURflo Aqua King II 4.0 GPM and SHURflo Aqua King II Supreme 5.0 GPM are the step-up models. For a complete dual-pump whole-boat system, the SHURflo High Flow System II is the top-of-line option. Pair with the SHURflo 65 PSI Wall-Mount Pressure Regulator when connecting to shore water.
Part Number: 4138-111-E65 | Voltage: 12V DC | 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.