Lisle Angled Disconnect Tool Set — 6‑Piece Plastic Fuel & A/C Quick‑Disconnect Tools, Fuel‑Resistant

Lisle 39400 Angled Disconnect Tool Set is a six-piece plastic tool kit designed to safely disconnect air conditioning spring-lock couplings and quick-connect fuel lines, including specialty fuel-sensor fittings on Duramax and Cummins engines.

This compact set gives technicians and DIYers the right fit for common domestic and import quick-disconnect fittings. The angled handles help reach confined spaces, while the fuel- and solvent-resistant plastic avoids marring delicate plastic sensors and connectors. Included sizes cover 5/16", 3/8", 1/2", 5/8", 3/4" and 7/8" connections so you can remove or install fuel filter sensors and HVAC springs without improvised tools.

How does this set protect delicate fuel filter sensors?

The disconnect tools are molded from durable plastic that resists gasoline, diesel and common workshop solvents, preventing the scissors-and-pliers damage that can crack plastic sensor hexes. Those sensors (notably on 2012–2016 6.6L Duramax) use a fragile plastic hex design that requires a precise fit to avoid rounding or breakage.

• Made of fuel- and solvent-resistant plastic to prevent corrosion and marring.
• Precisely sized openings match quick-disconnect hex profiles for safe removal.
• Angled handles allow controlled leverage without slipping or crushing fittings.
• Includes a 42mm-style wrench equivalent for specific diesel sensor access.

Which vehicles and connections will these tools work on?

These disconnects are intended for a wide range of domestic and import vehicles with quick-connect fuel lines and Ford/Chrysler-style AC spring-lock couplings. They’re useful when replacing fuel filters, servicing water sensors, or separating AC lines without damaging O-rings or plastic housings.

• Compatible with Ford and Chrysler spring-lock HVAC couplers.
• Fits common quick-disconnect fuel lines on many domestic and import models.
• Useful for Duramax 6.6L fuel filter water sensor removal (2012–2016).
• 42mm-style wrench geometry also suits 2013+ 6.7L Cummins sensor areas.

Why are the handles angled, and how does that affect use?

Angled handles let you reach connectors tucked behind components, along frame rails, or inside tight engine bays where straight tools can’t access. The extra clearance and ergonomic angle reduce wrist strain and let you apply controlled force to disengage locking tabs without twisting connectors or harming seals.

• Angled grips provide better access in confined engine-bay locations.
• Allows inline force to release locking collars without torquing the hose.
• Safer operation decreases risk of accidental connector damage.
• Each tool is sized for a specific coupling diameter to prevent slippage.

What sizes are included and can I buy pieces individually?

The set contains six sizes—5/16", 3/8", 1/2", 5/8", 3/4" and 7/8"—covering most quick-disconnect fittings found on fuel and AC systems. Lisle also offers each disconnect individually skin-packed if you only need a single size for a particular job.

• Six disconnect sizes cover a broad range of factory fittings.
• Individual tools are available separately for targeted replacement.
• Compact kit is easy to store in a toolbox or service cart.

Who is this for: Professional mechanics, fleet technicians, and DIY vehicle owners who service fuel filters, water sensors, and AC lines will benefit from the Lisle 39400 set. It’s specifically helpful where plastic sensor hexes or tight clearances make metal tools risky—anyone needing reliable, non-damaging quick-disconnect removal in domestic or imported vehicles will find this kit practical and cost-effective.