SHURflo Aqua King II Freshwater Pump — 12V, 2.0 GPM, 30 PSI (4128-110-E04)
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SHURflo Aqua King II Freshwater Pump — 12V, 2.0 GPM, 30 PSI
A compact, reliable 12V freshwater pressure pump for single-fixture marine installations. The SHURflo Aqua King II 4128-110-E04 delivers 2.0 GPM at 30 PSI — the right output for a single galley tap or head sink where consistent, smooth water pressure is the priority. The four-chamber diaphragm design eliminates the rapid cycling and pressure pulsing that single-chamber pumps are known for, delivering steady flow at all demand levels. The sealed motor and pressure switch live in a seamless E-coated housing built specifically for the marine environment, and the pump is dry self-priming up to 6 feet and can run dry without damage — a critical feature for marine installations where the tank can run low unexpectedly.
Key Features
- 2.0 GPM flow rate at 30 PSI — ideal for single-fixture galley or head 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, 3.5 amp draw — low power consumption
- Includes swivel straight adapter fittings: 1/2"-14 NPT × 1/2" barb (qty. 2)
- Direct replacement for Aqua King 2901 series (same mounting bracket)
Compatible Applications
- Single-fixture freshwater pressure systems (one galley tap or head sink)
- Powerboats, sailboats, and small cruisers with modest freshwater demand
- 12V DC freshwater systems requiring ignition-protected pumps
- Direct replacement for SHURflo Aqua King 2901 series installations
Parts Desk Insights
The 2.0 GPM Aqua King II is the entry-level model in the lineup — best suited for boats with a single tap where low power draw and compact size matter more than high flow. If you’re running two or more fixtures (galley + head, for example), step up to the SHURflo Aqua King II 3.0 GPM or the SHURflo Aqua King II 4.0 GPM. For the highest output in the Aqua King II family, the SHURflo Aqua King II Supreme 5.0 GPM handles full multi-fixture installations. For a complete whole-boat pressure system with maximum output, the SHURflo High Flow System II Dual Freshwater Pump System is the top-of-line option. Pair any of these pumps with a SHURflo 65 PSI Wall-Mount Pressure Regulator when connecting to shore water.
Part Number: 4128-110-E04 | Voltage: 12V DC | Flow Rate: 2.0 GPM | Pressure: 30 PSI | Amp Draw: 3.5A | 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.