Par-Max 3 12V Fresh Water Pump | 11.3LPM 40PSI

💧 JABSCO PAR-MAX 3 12V FRESH WATER PUMP – 11.3LPM / 40 PSI AUTOMATIC PRESSURE PUMP

High-Performance Triplex Fresh Water Pump for Caravans, RVs & Marine Systems – Supports Up to 3 Outlets

💦 The Jabsco Par-Max 3 is a proven automatic fresh water pressure pump designed for caravans, RVs and pleasure craft requiring strong, smooth water delivery across multiple outlets.

Delivering up to 11.3 litres per minute / 3 US gallons per minute and operating with a 25 PSI cut-in and 40 PSI cut-out pressure switch, the Par-Max 3 provides the flow needed for practical galley, shower and additional tap installations.

Its triplex three-chamber diaphragm design incorporates a built-in pulsation-dampening bypass valve that helps smooth water delivery at lower flow rates, reduce unwanted pump cycling and minimise noise – without requiring an accumulator tank in a typical installation.

The pump is also supplied with a 40-mesh plug-in inlet strainer, two 12mm barbed quick-connect hose fittings, soft rubber vibration-dampening mounts and corrosion-resistant motor construction, making it a comprehensive solution for new installations or upgrades to an existing fresh water system.

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⚡ KEY FEATURES

💦 Up to 11.3LPM Flow
Provides up to 3 US gallons per minute / 11.3 litres per minute for demanding caravan, RV and marine fresh water applications.

🚿 Supports Up to 3 Outlets
Designed to supply systems incorporating up to three 12mm outlets such as a galley tap, shower and additional faucet.

📈 25 PSI Cut-In / 40 PSI Cut-Out
Automatic pressure control starts and stops the pump according to water demand.

🔄 Triplex 3-Chamber Diaphragm
Three-chamber pump construction provides strong pressure and smooth water delivery for mobile fresh water systems.

⚙️ Built-In Bypass Valve
Pulsation-dampening bypass technology helps reduce unwanted cycling and improves low-flow operation.

💨 No Accumulator Normally Required
The integrated bypass system is designed to provide smoother flow without requiring a separate accumulator tank.

💧 Self-Priming to 2.4 Metres
Can draw water from a tank located below the pump within its stated 2.4m / 8ft priming capability.

🛡️ Dry-Run Capable
Designed to tolerate periods of dry running, adding protection if water supply is temporarily interrupted.

🔇 Quiet Operation
Soft rubber vibration-dampening mounts and bypass technology help reduce pump noise and vibration.

🧺 40-Mesh Inlet Strainer Included
Helps stop larger contaminants from entering the pump and is supplied in the box.

🔧 Quick-Connect Hose Ports
Includes two 12mm barbed plug-in fittings for straightforward installation and servicing.

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🚐 IDEAL FOR COMPLETE CARAVAN & RV WATER SYSTEMS

The Par-Max 3 is designed for customers who need more than a small single-tap water pump.

With up to 11.3LPM flow and support for as many as three 12mm outlets, it is particularly well suited to systems incorporating:

• 🚰 Kitchen / galley tap
• 🚿 Shower
• 🚰 Bathroom basin
• 🚐 Caravan fresh water system
• 🏕️ Camper trailer plumbing
• 🚤 Marine fresh water systems
• 🚙 4WD touring installations

This makes it a practical option for caravans and boats where a single pump needs to provide dependable pressure throughout the complete fresh water system.

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⚙️ AUTOMATIC PRESSURE OPERATION

The Par-Max 3 uses an automatic pressure switch with a listed:

Cut-In Pressure: 25 PSI

Cut-Out Pressure: 40 PSI

When a tap opens and system pressure falls to the cut-in point, the pump automatically starts.

Once the tap closes and pressure builds to the 40 PSI cut-out point, the pump switches itself off.

This provides convenient household-style water operation without manually switching the pump for each use.

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🔄 BUILT-IN BYPASS FOR SMOOTHER WATER FLOW

One of the major advantages of the Par-Max 3 is its integrated pulsation-dampening bypass valve.

When only a small amount of water is required, some conventional pressure pumps can rapidly cycle on and off as system pressure fluctuates.

The Jabsco bypass system helps manage these lower-flow conditions more smoothly, resulting in:

• 💧 Smoother water delivery
• 🔄 Reduced pump cycling
• 🔇 Lower operating noise
• 🚰 Better performance when taps are partially open
• ⚙️ Reduced need for additional accumulator hardware

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💨 NO ACCUMULATOR TANK REQUIRED

The built-in bypass is specifically designed to reduce pulsation and unwanted cycling without requiring a separate accumulator tank in a typical installation.

This can simplify the plumbing system, save installation space and reduce the number of additional components required.

⚠️ An accumulator may still be useful in some specialised plumbing configurations, but it is not listed as necessary for normal operation of the Par-Max 3.

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💧 SELF-PRIMING TO 2.4 METRES

The Par-Max 3 is self-priming up to approximately 2.4 metres / 8 feet.

This allows the pump to be mounted above the fresh water tank while still drawing water through the inlet line, provided the installation remains within the pump's stated limits.

This gives considerably greater installation flexibility than a centrifugal pump that needs to be submerged or gravity fed.

⚠️ Air leaks, long inlet hoses, restrictive fittings and filters can reduce real-world priming performance. Keep the suction side airtight and as unrestricted as practical.

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🚿 UP TO 11.3LPM / 3GPM FLOW

Maximum stated flow is approximately:

11.3 Litres Per Minute

3 US Gallons Per Minute

This gives the Par-Max 3 enough capacity for showers and multi-outlet fresh water systems where a small 3–4LPM pump may not provide sufficient performance.

⚠️ Maximum flow should not be interpreted as guaranteed flow from every tap. Available flow decreases as system pressure, plumbing restriction and simultaneous demand increase.

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🚿 SERVES UP TO THREE 12MM OUTLETS

The Par-Max 3 is designed to supply up to three 12mm outlets.

A typical setup could include:

• 🚰 1 × Galley tap
• 🚿 1 × Shower
• 🚰 1 × Additional faucet or basin

The outlets do not necessarily need to be used individually, but when multiple outlets are opened at once the pump's available flow is shared between them.

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🧺 40-MESH INLET STRAINER INCLUDED

A 40-mesh plug-in inlet strainer is supplied with the pump.

The strainer helps prevent larger debris from entering the pump's diaphragm and valve assembly, providing useful protection for the water system.

It also uses the same practical plug-in style connection for straightforward removal and cleaning.

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🔇 DESIGNED FOR QUIETER OPERATION

The Par-Max 3 combines several features aimed at reducing the vibration and cycling noises commonly associated with caravan water pumps.

• Soft rubber vibration-dampening mounts
• Triplex three-chamber diaphragm design
• Built-in pulsation-dampening bypass
• Reduced unwanted cycling at low demand

Installation still has a major effect on noise. Mounting the pump to a solid surface and avoiding rigid plumbing immediately beside the pump can help reduce transmitted vibration further.

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🛡️ DRY-RUN CAPABILITY

The Par-Max 3 is designed to tolerate periods of running dry, providing protection if the fresh water tank becomes empty or water supply is temporarily interrupted.

⚠️ Dry-run capability should be treated as a protection feature rather than a normal operating mode. Avoid unnecessary extended operation without water.

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🔧 QUICK-CONNECT 12MM HOSE FITTINGS INCLUDED

The pump includes two plug-in 12mm barbed hose fittings.

Quick-connect plumbing makes installation and servicing much easier than permanently threaded connections, particularly when the pump is mounted inside a confined caravan or boat compartment.

Advantages include:

• 🔧 Easier installation
• 🛠️ Faster servicing
• 💧 Quick strainer removal
• 🚐 Easier pump replacement

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🛡️ CORROSION-RESISTANT CONSTRUCTION

The Par-Max 3 incorporates a corrosion-resistant motor construction designed for fresh water applications in demanding caravan and marine environments.

This makes it particularly suitable for mobile installations where vibration, humidity and changing environmental conditions are part of everyday use.

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📋 TECHNICAL SPECIFICATIONS

Brand: Jabsco

Series: Par-Max 3

Product Type: Automatic Fresh Water Pressure Pump

Pump Design: Triplex / 3-Chamber Diaphragm

Maximum Flow: 11.3LPM / 3 US GPM

Pressure Switch Cut-In: 25 PSI

Pressure Switch Cut-Out: 40 PSI

Automatic On-Demand Operation: Yes

Self-Priming: Yes

Maximum Self-Priming Height: 2.4 Metres / 8 Feet

Built-In Bypass: Yes

Pulsation Dampening: Yes

Accumulator Tank Required: No

Dry-Run Capability: Yes – Can Run Dry for Periods

Mounting: Soft Rubber Vibration-Dampening Mounts

Inlet Strainer: 40-Mesh Plug-In Strainer Included

Hose Ports: Quick-Connect Plug-In

Included Hose Fittings: 2 × 12mm Barbed Fittings

Motor: Corrosion Resistant

Suitable Outlets: Up to 3 × 12mm Outlets

Applications: Caravan, RV, Pleasure Craft & Fresh Water Systems

⚠️ VOLTAGE NOTE: The description references the Par-Max 3 range being available in 12V or 24V versions. This listing is for the 12V model. Do not connect a 12V model directly to 24V.

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🔧 INSTALLATION CONSIDERATIONS

• Confirm you have the correct 12V pump version
• Mount the pump securely using the soft vibration-isolating mounts
• Install the included 40-mesh inlet strainer
• Keep the suction line airtight for reliable self-priming
• Use suitable fresh-water-rated hose
• Use the supplied 12mm barbed plug-in fittings where appropriate
• Keep inlet restrictions to a minimum
• Ensure taps, filters, hot-water systems and fittings are compatible with 40 PSI system pressure
• Use correctly sized electrical cable and fuse protection
• Protect electrical wiring from moisture and abrasion

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❓ FREQUENTLY ASKED QUESTIONS

Is this a good pump for a caravan with a kitchen sink and shower?

Yes. This is exactly the type of system the Par-Max 3 is designed for. Its 11.3LPM capacity and 40 PSI pressure capability make it substantially better suited to shower and multi-outlet use than a compact 3–4LPM sink pump.

Can it run a kitchen tap, shower and bathroom basin?

Yes. Jabsco specifies the pump for up to three 12mm outlets, including a galley, shower and additional faucet. Flow is shared if several outlets are operated simultaneously.

Will it give me decent shower pressure?

With up to 11.3LPM flow and a 40 PSI pressure switch, the Par-Max 3 is much better suited to caravan shower use than a small low-flow pump. Actual shower performance still depends on the shower head, plumbing size, filters and hot-water system.

Can I use two taps at the same time?

Yes. The pump is designed for multi-outlet systems, but the available flow is shared between whichever fixtures are open. Two low-flow outlets may operate comfortably together, while higher-flow fixtures will have a greater effect on each other.

Do I need an accumulator tank with this pump?

No. The built-in bypass valve is designed to dampen pulsation and control unwanted cycling, so Jabsco specifies that an accumulator is not required for normal operation.

What does the bypass valve actually do?

It helps the pump cope with low water demand without rapidly switching on and off. This provides smoother flow when a tap is partially open and can also reduce vibration and pump noise.

Will it automatically switch on when I open a tap?

Yes. When pressure drops to approximately 25 PSI the pump starts automatically. When the tap closes and system pressure rises to approximately 40 PSI, the pump switches off.

Can I mount the pump above the water tank?

Yes, within its stated self-priming limit. The Par-Max 3 can self-prime to approximately 2.4 metres / 8 feet, giving considerable flexibility in pump placement.

Is the 2.4 metre rating the maximum hose length?

No. The 2.4 metres refers to the stated self-priming lift. Total hose can be longer, but air leaks, excessive fittings and plumbing restriction can reduce performance.

Does it include an inlet filter?

Yes. A 40-mesh plug-in inlet strainer is included with the pump.

Why is an inlet strainer important?

It helps prevent larger contaminants from entering the pump and potentially interfering with the diaphragm or valves. It can also be removed periodically for inspection and cleaning.

Does it suit standard 12mm caravan hose?

The pump includes two 12mm barbed plug-in fittings, making it well suited to compatible 12mm fresh water hose installations.

Can the pump run dry if my tank runs empty?

Yes. The Par-Max 3 is specified as capable of running dry for periods, providing useful protection if the tank empties. Deliberately running it dry unnecessarily should still be avoided.

Is it noisy?

The Par-Max 3 is specifically designed for quiet operation, using soft rubber mounts and an internal bypass to reduce vibration and cycling. Installation quality still has a major influence on how much noise is transmitted into caravan cabinetry.

Will it work from a lithium battery?

Yes. This 12V model can operate from a suitable 12V lithium auxiliary system when correctly wired and fused.

Will it work from an AGM battery?

Yes. A healthy 12V AGM auxiliary battery can also operate the pump when the electrical circuit is correctly configured.

How much battery power does it use?

A specific current draw is not provided here, so battery consumption should not be calculated from an assumed figure. Confirm the current electrical specification for the exact 12V model if power consumption is important to your system design.

Can I use it with a caravan hot-water service?

Potentially, provided the hot-water unit, pressure-reducing equipment and plumbing are compatible with the pump's 25 PSI cut-in and 40 PSI cut-out pressure. Check the water heater manufacturer's specifications before installation.

Can I install a water filter in the system?

Yes, provided the filter is correctly sized for the required flow and pressure. Excessively restrictive filters can reduce water flow and affect pump performance.

How does this compare with the Jabsco Par-Max 1 PLUS 3.8LPM pump?

The Par-Max 1 PLUS is better suited to a small single-outlet system. The Par-Max 3 provides around three times the maximum flow and is designed to support up to three outlets, making it the stronger option for a caravan with a shower and multiple taps.

How does this compare with the FLOJET 11LPM pump?

Both are aimed at multi-outlet caravan and RV water systems and both use diaphragm technology with internal bypass functionality. The Par-Max 3 is rated at 11.3LPM, operates between 25 and 40 PSI, self-primes to 2.4 metres and includes a 40-mesh inlet strainer plus two 12mm barbed fittings. Final choice should consider required pressure, plumbing connections and the system being replaced.

Is 40 PSI suitable for normal caravan plumbing?

It is a commonly useful pressure level for caravan-style water delivery, but the complete system still needs to be checked. Hoses, fittings, filters, faucets and hot-water appliances must all be suitable for the pump's operating pressure.

Can I use the 24V version in a 12V caravan?

No. The Par-Max 3 range is referenced as being available in both 12V and 24V versions, but the voltage of the pump must match the electrical system. This listing is for the 12V version.

Would this be a good upgrade from my old caravan water pump?

Potentially. It is especially attractive where the existing pump struggles with shower flow, is noisy or cycles excessively. Before replacing it, compare voltage, pressure, flow, hose connections, available mounting space and electrical requirements.

What should I check before buying?

Confirm that you need the 12V version, make sure the 11.3LPM capacity suits your number of outlets, check that your plumbing and hot-water equipment are suitable for a 40 PSI cut-out pressure, confirm that 12mm hose fittings suit your system and verify the electrical current and fuse requirements before wiring the pump.

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💧 SMOOTH, QUIET WATER PRESSURE FOR SERIOUS CARAVAN & MARINE SYSTEMS

The Jabsco Par-Max 3 is a strong choice for customers who want reliable automatic fresh water delivery across more than just a single tap.

With up to 11.3LPM flow, support for three outlets, 25–40 PSI automatic pressure operation, self-priming to 2.4 metres, a built-in pulsation-dampening bypass and included inlet strainer and hose fittings, it provides a comprehensive solution for caravan, RV and marine fresh water systems.

For a galley, shower and additional faucet setup where smooth flow, reduced cycling and dependable pressure matter, the Par-Max 3 delivers a practical step up from smaller entry-level water pumps.