RJSPHH Air Line Disconnect Set — 5-Piece 42400, Low-Profile Tools for Heavy Trucks

The RJSPHH 42400 is a five-piece air line disconnect tool set designed to quickly release push-in fittings on heavy-duty truck air systems and related pneumatic lines.

This compact kit brings five commonly used sizes together so mechanics, fleet technicians, and DIYers can detach air hoses and fittings fast — even in cramped engine bays or undercarriages. The tools slip over the plastic or nylon tubing and depress the internal collar of the quick-connect fitting, freeing air lines from brakes, suspensions, valves, and other pneumatic components without cutting or damaging the hose.

How does the set speed up disconnecting air lines?

Each tool is shaped to slide into quick-connect fittings and press the release collar with one hand, removing the need to twist or pry. That means faster service times and less fumbling when working under vehicles or in tight spaces.

• Five sizes cover the most common tubing diameters used on heavy trucks.
• Low-profile heads let you reach fittings in confined areas.
• Single-handed operation frees your other hand for holding hoses or tools.

Which fittings and systems will these disconnect tools work on?

The RJSPHH set is intended for push-in quick-connect pneumatic fittings commonly found on heavy-duty truck brake lines, air suspensions, steering components, and various control valves. It’s compatible with standard push-to-connect collars on nylon and plastic tubing used in many commercial vehicles.

• Brake system air lines and reservoirs
• Air suspension tubing and height control valves
• Flow control, check, shuttle, and quick-exhaust valves

What sizes are included and why do they matter?

This kit contains five popular diameters so you can match the disconnect tool to the tube size for a clean release without damaging the sleeve or fitting. Using the correct tool size prevents slippage and minimizes wear on the fitting collars.

• 1/8"–5/32" for small pilot lines
• 1/4" for many control and sensor lines
• 3/8" and 1/2" for common service and suspension tubing
• 5/8" for larger supply lines or specialty fittings

How durable and supported is the RJSPHH disconnect set?

The tools are built for workshop use, offering a sturdy feel for repeated service jobs. RJSPHH backs the set with a one-year warranty and responsive customer support to address any issues or replacements.

• Workshop-ready construction for frequent use
• Designed to resist bending or deformation during normal service
• One-year warranty and 24-hour customer response promise

Who is this for: The RJSPHH 42400 five-piece disconnect set is ideal for fleet maintenance teams, truck repair shops, mobile mechanics, and hands-on owners who service heavy-duty vehicles. If you regularly disconnect air fittings on brakes, suspensions, steering, or pneumatic valves and need a small, organized kit that fits in a toolbox or service cart, this set reduces downtime and protects fittings during removal.