Lisle Master Plus Disconnect Set 39850 — compact fuel, A/C & transmission quick-disconnect kit with molded case

The Lisle 39850 Master Plus Disconnect Set is a compact, molded kit containing the most commonly used quick-disconnect tools for fuel lines, A/C fittings and transmission cooler lines.

This kit collects multiple specialty disconnect tools into a single, durable case so technicians and DIYers can separate quick-connect fittings cleanly and without improvisation. The molded case keeps tools organized and protected, while each tool is shaped to engage a range of spring-lock couplings used on modern vehicles' fuel, air-conditioning and transmission oil cooler systems.

Which vehicle connections will this set help me service?

The Lisle 39850 targets common automotive quick-disconnects: fuel line quick connects, spring-lock fittings on refrigerant and AC lines, plus transmission oil cooler couplings. It’s designed around the shapes and sizes most frequently encountered in domestic and import cars and light trucks.

• Fuel line quick-connects found on in-tank and inline systems
• Spring-lock A/C line fittings used on evaporator and condenser connections
• Transmission oil cooler quick disconnects on many external cooler lines
• Molded case for easy selection and safe storage

How do these tools make disconnecting faster and safer?

Purpose-built tips slide into the coupling and release the retaining collars without damaging the plastic housings or metal fittings. That minimizes crushed fittings, torn O-rings, and dropped clips that would otherwise require replacement or extra labor.

• Precise fit reduces the need for force and prevents part damage
• Handle geometry provides leverage in confined engine bays
• Molded slots hold tools so you can carry the set to the work area

What’s included and how is the set organized?

The kit groups the most popular disconnect tools inside a molded, snap-shut case so you can keep the right tip handy. Each tool is shaped for a family of connector sizes and stored in a dedicated cavity to avoid mix-ups on the job.

• Multiple tool profiles for fuel, A/C, and transmission quick-disconnects
• Durable molded case with labeled cavities for each piece
• Compact footprint for toolboxes or on-board storage

Will this set fit my older or uncommon fittings?

The kit covers the most commonly encountered styles but may not fit extremely rare or proprietary connectors. It’s ideal for routine maintenance and repairs on mainstream vehicles; specialty or manufacturer-specific fittings could require additional tools.

• Excellent coverage for mainstream domestic and import vehicles
• May not include sizes for specialty OEM-only connectors
• Useful as a general-purpose kit; evaluate compatibility for uncommon vehicles

Who this set is for: The Lisle 39850 Master Plus Disconnect Set is aimed at professional mechanics, independent technicians, and informed DIY enthusiasts who want a reliable, space-saving solution for disconnecting fuel lines, A/C lines, and transmission oil cooler fittings. If you perform routine fuel-system servicing, refrigerant line work, or cooling-system repairs, this kit reduces guesswork and helps avoid damage that leads to additional parts and downtime.