Lisle Angled Disconnect Tool Set, 6-Piece Plastic Fuel & AC Quick-Connects with 42mm for Duramax/Cummins

The Lisle 39400 Angled Disconnect Tool Set is a six-piece plastic tool kit designed to safely release air-conditioning and quick-connect fuel line fittings, including the water-sensor fitting on select Duramax and Cummins engines.

This compact, angled disconnect set gives technicians and home mechanics a safer, easier way to separate spring-lock and quick-connect couplings without damaging delicate plastic fittings. Each tool is molded from fuel- and solvent-resistant plastic and shaped to access confined engine bays, reducing the risk of rounded hexes or crushed sensor bodies that metal pliers can cause.

How does this set help when replacing fuel filters or servicing water sensors?

The Lisle 39400 set includes a 42mm wrench-compatible design specifically for removing and installing the plastic water sensor on 2012–2016 6.6L Duramax fuel filters, and the 42mm tool also fits 2013+ 6.7L Cummins applications. Using the correct-size plastic disconnect prevents damage to the sensor’s new hex form and simplifies removal in tight spaces.

• Includes the 42mm size used on Duramax and Cummins water sensors.
• Plastic construction avoids marring or cracking sensor hexes.
• Angled handles let you work around brackets and hoses.
• Sized for fuel-filter replacement and routine water-sensor service.

Which quick-connect fittings and vehicles are compatible with these tools?

These disconnects are engineered to release spring-lock couplings found on many Ford and Chrysler air-conditioning lines and a broad range of domestic and import fuel-line quick-connects. The set’s six sizes cover common hose diameters for both fuel and AC service.

• Works on Ford and Chrysler AC spring-lock couplings.
• Suitable for many domestic and import fuel quick-disconnects.
• Six sizes (5/16" to 7/8") cover typical hose diameters.
• Individual pieces are also sold separately for targeted repairs.

Why are the handles angled and why does the material matter?

The molded angled handles give you reach and clearance in cramped engine compartments so you can depress locking tabs and separate couplings without contorting the fitting or the tool. The durable plastic resists common fuels and automotive solvents, maintaining shape and fit where metal could slip or corrode.

• Angled profiles improve access behind components and brackets.
• Plastic resists fuel and solvent exposure better than untreated metals.
• Tool shape minimizes slippage that can damage fittings.
• Available individually for replacing a worn or lost size.

Who is this for: The Lisle 39400 set is aimed at professional technicians, fleet maintenance shops, and experienced DIYers who routinely service fuel filters, water sensors, and AC quick-disconnects. If you work on 2012–2016 6.6L Duramax or 2013+ 6.7L Cummins engines, or you want a safe, non-marring way to separate spring-lock and quick-connect lines on domestic and import vehicles, this set reduces repair time and risk of damage to plastic fittings.