PRESSURE SWITCH, 41 PSI FITS AQUAJET 4.0GPM

The SPX FLOW / Johnson Pump 09-46781-01 Pressure Switch is a genuine replacement component designed for Aqua Jet freshwater pressure systems, including the Aqua Jet Duo WPS water pressure system. This switch automatically controls pump operation by monitoring system pressure and turning the pump on or off as demand changes.

With a cut-off pressure of 2.8 bar (approximately 40–41 PSI), the switch ensures smooth and consistent water delivery throughout onboard plumbing systems. When system pressure drops, the switch activates the pump to restore pressure. Once the preset pressure level is reached, the switch shuts the pump off to prevent unnecessary operation and reduce wear on system components.

This replacement pressure switch is commonly used on Johnson Pump Aqua Jet freshwater systems and washdown pumps, including high-capacity systems like the Aqua Jet Duo WPS 10.4, which features dual pumps, an integrated accumulator tank, and inlet strainers for stable water pressure onboard.

Replacing a worn or faulty pressure switch can resolve common freshwater system issues such as pumps running continuously, short cycling, or failing to shut off when pressure builds.

Key Features

• Genuine SPX FLOW / Johnson Pump replacement component
• Designed for Aqua Jet freshwater pressure systems
• 2.8 bar / 40–41 PSI cut-off pressure
• Maintains automatic pump start and stop operation
• Helps prevent continuous pump operation and pressure fluctuations
• Compact design for quick service replacement
• Durable construction designed for marine environments
• Compatible with 12V and 24V DC freshwater pump systems

Technical Specifications

Compatible Systems and Pumps

The 09-46781-01 pressure switch is designed for use with Johnson Pump Aqua Jet freshwater systems, including:

Aqua Jet Water Pressure Systems

• Aqua Jet Duo WPS 10.4 (12V / 24V)
• Aqua Jet UNO WPS series
• Aqua Jet UNO MAX systems

Aqua Jet Washdown Pumps

• WD 3.4
• WD 5.0
• WD 5.2

These systems rely on pressure-controlled pump cycling to maintain steady freshwater pressure for onboard plumbing and washdown applications.

Typical Applications

• Marine freshwater pressure systems
• Boat sinks, showers, and galleys
• Marine washdown pump systems
• RV or mobile water systems using Aqua Jet pumps

Additional System Information

The Aqua Jet Duo water pressure system is a high-capacity freshwater unit featuring two parallel-connected diaphragm pumps, integrated inlet strainers, and a pre-pressurized accumulator tank to maintain stable water pressure and reduce pump cycling.

The pressure switch is a key control component within the system, ensuring the pumps activate only when water demand requires it.