DF0100 – DREWFAB Jet Drive Water Bypass Kit | 10–25 PSI Marine Cooling Pressure Regulator

DREWFAB Water Bypass Kit – Jet Boat Cooling Pressure Regulator (10–25 PSI)

Prevent dangerous over-pressurization in your marine engine with the DREWFAB Water Bypass Kit, engineered specifically for jet boat cooling systems. Many jet boats use automotive-based engines that require coolant pressures below 25 PSI—this bypass kit ensures your engine stays within safe limits, protecting against costly damage from excessive pressure.

Designed for open-loop jet drive cooling systems, the DREWFAB bypass maintains optimal pressure between 10 and 25 PSI (depending on your chosen poppet valve). Built from premium anodized aluminum and stainless hardware, it’s durable, easy to install, and compatible with most jet drive water ports and cooling line configurations.

Key Features

• Prevents over-pressurization — keeps cooling system pressure safely below 25 PSI.

• Designed for jet boat engines using open cooling systems and automotive powerplants.

• Dual-pressure options: 10 PSI or 25 PSI poppet valve.

• Flexible installation: mount directly to the jet drive water port or inline with the cooling feed.

• High-quality fittings: precision -10AN and -8AN components for reliable, leak-free performance.

Kit Contents

Bypass Assembly

• (1) -10AN ball valve

• (1) -10ORB in / (2) -8ORB out Y-block

• (1) -8 poppet valve (10 or 25 PSI)

• (1) -8AN fitting

Optional Components

• (1) -10AN female/female union

• (1) -10AN female to 3/8NPT adapter

• (1) -8AN bypass hose assembly:

  • (1) -8AN 150° hose end – black

  • (1) 6' 1/8AN black nylon braided hose

  • (1) -8AN straight hose end – black

  • (1) -8AN bulkhead fitting – black

  • (1) -8AN bulkhead nut – black

Technical Specs

• Inlet: -10AN

• Outlet: -8AN

• Bypass hose: -8AN (exits hull)

• Pressure options: 10 PSI or 25 PSI poppet valve

• Materials: anodized aluminum, stainless hardware