Johnson Pump Aqua Jet WPS 4.0 GPM – 12V – NPT – 2.8 Bar – 10-13406-103

The Johnson Pump Aqua Jet WPS 4.0 GPM Water Pressure Pump System is a high-performance, intelligent freshwater pressure solution designed for boats, RVs, and mobile water systems that require quiet operation and consistent water delivery. Powered by a 12V DC electrical system, this unit delivers up to 4.0 gallons per minute at 2.8 bar (approximately 40 PSI), providing reliable pressure for sinks, showers, and multiple onboard fixtures.

Utilizing variable-speed diaphragm pump technology, the Aqua Jet WPS automatically adjusts pump output based on water demand. This ensures smooth, pulse-free water flow, reduced noise and vibration, and improved energy efficiency. The integrated electronic pressure control eliminates the need for an accumulator tank, simplifying installation while maintaining steady system pressure.

Built with marine-grade, corrosion-resistant materials, the Aqua Jet WPS is engineered for long-term durability in harsh environments. NPT threaded ports allow easy integration with standard plumbing systems, making this pump ideal for both new installations and system upgrades.

What's In the Box

This model is typically sold as a comprehensive kit that includes several fitting options to match your existing plumbing:

• Aqua Jet WPS 4.0 Pump: The main 12V unit with an integrated 41 PSI (2.8 Bar) pressure switch.

• NPT Threaded Fittings: Includes 3/8" NPT and 1/2" NPT connectors for rigid pipe systems.

• Hose Barb Fittings: Includes 1/2" and 3/4" hose barb connectors for flexible tubing.

• KlickTite™ Connectors: Quick-connect swivel ports that make installation and winterization maintenance much easier.

• Rubber Mounting Feet: Pre-installed vibration-dampening feet to further ensure whisper-quiet operation.

Ideal Applications

• Powerboats and sailboats

• RVs and campers

• Off-grid cabins and mobile water systems

• Freshwater pressure system upgrades

Why Choose the Johnson Pump Aqua Jet WPS 4.0 GPM?

The Aqua Jet WPS 4.0 GPM delivers residential-style water pressure in a compact, intelligent system. With smooth flow, simplified installation, and durable marine construction, it’s an excellent choice for boaters and RV owners seeking dependable performance without unnecessary complexity.

Installation & Maintenance Tip

To protect your pump's internal valves from sand or tank debris, it is highly recommended to install a Johnson PUMProtector inlet strainer on the intake side. Also, ensure you use Teflon tape on the NPT threads to prevent air leaks, which can cause the pump to "cycle" even when your faucets are closed.

Manufacturer : Johnson Pump
Manufacturer Part No : 10-13406-103