4JJ3 Pre-Filter and Catch Can - With In Cab Water Alarm - 2020 On

PreLine-Plus Pre-Filter Kit

• PreLine-Plus pre-filter with spin-on filter element
• In-cab multi-stage water alarm (visual and audible)
• Vehicle-specific bracket and fittings

ProVent Ultimate Catch Can Kit

• ProVent catch can
• Vehicle-specific bracket, hoses and fittings
• Drain, with optional return-to-sump configuration

Mounts between the tank and the factory filter. The in-cab alarm tells you when water is in the fuel, so there is no manual checking.

• 100% water separation efficiency (Direction Plus figure, based on 150 micron droplet size).
• 98% particle separation (based on 30 micron particles).
• Remote multi-stage water alert, visual and audible, in the cab.
• Spin-on filter element for quick changes.
• No bypass, so contaminated fuel does not get through to the injectors.

• Up to 98% oil separation efficiency.
• Keeps oil and soot out of the intake, turbo and intercooler.
• Reduces EGR-related carbon build-up.
• Helps stabilise crankcase pressure and reduce smoke.
• Optional return-to-sump configuration.

• Isuzu D-MAX, 4JJ3-TCX 3.0L 4-cylinder turbo diesel, 2020 to 2026
• Isuzu MU-X, 4JJ3-TCX 3.0L 4-cylinder turbo diesel, 2020 to 2026
• Mazda BT-50, 4JJ3-TCX 3.0L 4-cylinder turbo diesel, 2020 to 2025

Not for the 4JJ1. 2012 to 2020 D-MAX and 2013 to 2020 MU-X with the 4JJ1 use a different kit, listed separately. 2026 BT-50: not yet in the Direction Plus fitment table, send us your VIN.

Fitment per Direction Plus as of October 2026. Check the fitment guide or send us your VIN if unsure.

• Vehicle-specific kit for a bolt-on installation. We recommend fitting by a competent mechanic.
• The PreLine-Plus mounts ahead of the factory filter, with the alarm wired into the cab.
• The ProVent connects to the crankcase breather. Run it with a drain or set it up to return oil to the sump.
• Service the spin-on pre-filter element and the ProVent element at your service interval.

• Free express shipping Australia-wide.
• Pay in full or split it with Afterpay, Humm, Klarna or Zip at checkout.
• Tracking is sent as soon as the kit is on its way.
• Returns and warranty are handled under our refund policy.

Q: Does this fit the BT-50 as well as the D-MAX and MU-X?
A: Yes. Direction Plus lists it for the 4JJ3-TCX D-MAX and MU-X (2020 to 2026) and BT-50 (2020 to 2025).

Q: Is the water alarm included?
A: Yes. The in-cab multi-stage water alarm comes with the PreLine-Plus kit and gives a visual and audible warning when water is detected.

Q: Can the ProVent return oil to the sump?
A: Yes. It can be set up to drain or to return oil to the sump.

Q: Do I need both systems?
A: They protect different things. The pre-filter keeps water and dirt out of the fuel system, the catch can keeps oil and soot out of the intake. Either can be bought separately, the combo gets you both in one order.