Jabsco Par-Max HD4 12V Heavy Duty Water Pump – 4 GPM, 40 PSI

Overview

The Jabsco Par-Max HD4 is part of an updated lineup designed to deliver years of service in freshwater systems big and small. The HD family features a wider diameter motor with a powder-coated shell, cast aluminum endbells and a lower housing to improve pressure capability and life. This 12 V DC model delivers a practical balance of flow and pressure for compact spaces like engine rooms, cabins, or heads on boats and RVs.

Key benefits at a glance

• Heavy-duty coated motor for enhanced durability in damp environments
• Integrated pressure switch for straightforward installation
• Efficient, quiet operation that stays unobtrusive
• Self-priming design for easy startup from a storage tank
• Runs dry without damage, reducing concern during low-water conditions

Performance you can size for

Designed for 12 V systems, the HD4 pumps up to 4 GPM at about 40 PSI. It sits within a family that offers configurations up to 6 GPM and 60 PSI, giving you flexible options for different vessel needs. A plastic housing helps shield the motor from corrosion while keeping the footprint economical and installer-friendly.

Real-world use cases

• Marine vessels with multiple freshwater outlets such as sinks, shower, and head benefit from steady, reliable flow
• RV or tiny-house setups where a compact, quiet pump is desirable
• Cabins and engine rooms needing corrosion protection and simple mounting

What to expect in your setup

Look for dependable pressure delivery, easy installation, and consistent performance across typical marine environments. While results can vary with system design, the Par-Max HD4 is built to support a dependable freshwater supply without frequent maintenance.