What Do Semi Truck Air Lines & Fittings Do?
Air lines carry compressed air to power the air brake, trailer service/emergency lines, suspension, and other pneumatic accessories on the rig.
When there’s a cracked hose, loose fitting, or leaky connection, you lose air pressure which results in costly downtime and unsafe operating conditions.
How to Choose the Right Fittings
Choose the connection type.
Push-to-connect (quick connect) fittings: great for fast repairs without extra tools, especially when you have nylon air brake tubing.
Compression fittings: ideal for a strong, locked-in connection.
Threated Adapters (NPT and similar): usually paired with elbows, tees, reducers, and unions, thread adapters connect into valves, tanks, manifolds, and ports.
Confirm the size before you buy. What tube OD, thread size/type or style do you need? Is it a straight, tee, union, reducer, bulkhead/pass-through, or 45 or 90-degree angle?
Prioritize the application type: tractor-trailer air lines that need flexibility (coiled set, gladhands, and swivels), under-chassis air tubing that needs long, connectors (nylon tubing, quick-connectors at ports), or auxiliary air that demands serviceability and solid air pressure to the accessory.
Why Upgrade Your Air Line Setup?
- Stay DOT-compliant with durable, leak-free hoses and fittings.
- Prevent downtime with aftermarket parts that last through extreme temps and road abuse.
- Improve flexibility with coiled trailer air lines that reduce kinks and wear.
- Simplify repairs with pre-assembled hose kits, backplates, and bulkhead accessories.
- Maximize compatibility with universal fittings, rubber air intake hose adapters, and trailer gladhand sets.
Shop for Critical Air Line Parts
Semi truck air line fittings and hoses: nylon air braking tube, rubber and flexible hydraulic air hoses, and coiled tractor-trailer air line sets.
Trailer hookups and gladhands: extended-grip gladhands, airline box backplates and mounting accessories to organize multiple lines.
Common Leak Causes (Quick Fix Checklist)
- Tubing end isn’t cut square (quick connect fittings need a clean, straight cut).
- Tube OD or fitting type doesn’t match the system.
- Threaded connections need proper sealing method and clean threads.
- Lines are rubbing through on brackets or frame edges.
Complete the replacement by grabbing extra parts:
semi truck air dryer kits,
automatic slack adjusters, extra unions/elbows, protective loom/grommets for abrasion points, gladhand seals or replacement parts if the hookups are broken, or air dryer-related replacement parts if there is moisture entering the system.
