RJSPHH Air Line Disconnect Set 5-Piece for Heavy-Duty Trucks — Push-to-Connect Keys, Low-Profile Slim Shafts

Compact five-piece RJSPHH air line disconnect set for heavy-duty truck pneumatic fittings lets you release push-to-connect air lines quickly and in tight spaces.

Designed for mechanics, fleet technicians, and vehicle owners who work on heavy-duty truck pneumatic systems, this RJSPHH 42400 kit supplies five commonly used sizes so you can access brake, suspension and engine air fittings without cutting lines or struggling with awkward angles. The tools are shaped for single-handed use in cramped engine bays and undercarriage locations and include a one-year warranty for manufacturing defects. Below you'll find straightforward answers to common buyer questions and exact details on what each bit does.

Which air line sizes are included and what fittings will they work with?

The kit contains five disconnect keys sized for the most frequent push-to-connect fittings used on heavy-duty trucks and related air systems. Each key corresponds to a tubing or connector dimension so you can match it to the push-in collar for a clean release.

• 1/8"–5/32" key — small pilot lines and control tubing
• 1/4" key — medium control and accessory lines
• 3/8" key — common brake and suspension pilot lines
• 1/2" key — larger air supply lines and actuators
• 5/8" key — main feed lines and bulk connectors

How does the RJSPHH disconnect set perform in tight spaces?

Each key is slim and designed so a single hand can depress the retaining collar while pulling the tubing free, making them suitable for cramped under-truck or engine-bay locations. The slim profile reduces the need to remove surrounding components to access a connector.

• Low-profile shaft for narrow clearances
• Single-hand operation reduces need for a partner
• Rigid construction to avoid bending during use

Which vehicle systems can I safely disconnect with this set?

The RJSPHH 42400 keys are intended for typical pneumatic quick-disconnect push-in fittings found across multiple truck systems. They let you separate lines on non-pressurized service points once the system is safely isolated and depressurized.

• Air brakes — lines and control circuits (after depressurizing)
• Suspension — air spring and leveling fittings
• Engine and accessories — valves and actuators with push-fit collars
• Flow control, check, shuttle and quick-exhaust valves

What warranty and support come with the kit?

RJSPHH backs the 42400 set with a one-year warranty covering manufacturing defects, and customer support is available for assistance. If you encounter issues, contact the seller and expect a response within 24 hours for guidance or warranty help.

• One-year limited warranty for defects
• Responsive customer support with a 24-hour reply pledge
• Clear replacement or support steps when parts are faulty

Who this set is for: The RJSPHH 42400 five-piece disconnect kit suits fleet technicians, truck maintenance shops, mobile service providers and DIYers who regularly service heavy-duty truck air systems. If you need a compact, no-nonsense toolset to release push-fit pneumatic lines during repairs, diagnostics, or component replacement—especially when space is limited—this kit provides the range of sizes and single-handed handling to make the job faster and less awkward.