Alkon DuraLink DOT air brake tubing, part number DL04BL50, provides 50 feet of black, 1/4-inch outside-diameter nylon tubing for air brake and air suspension plumbing. Choose it for new tubing runs or replacement work where the system calls for this tube size and construction. Manufactured in the USA.
The 1/4-inch measurement is the tube’s outside diameter, not its bore or a pipe-thread size. Match it to fittings specified for 1/4-inch OD nylon air brake tubing, and check the vehicle or equipment requirements before making a substitution. This item supplies tubing; connection fittings and routing hardware are selected separately.
Cut the length your installation needs
The 50-foot length lets you prepare individual runs to suit the installation rather than ordering a preassembled hose. Black tubing can be matched to an existing line-color scheme, while the nylon Type A construction keeps the selection distinct from larger reinforced Type B tubing in the DuraLink range.
| Feature |
Benefit |
| 50-foot length |
Cut individual runs to suit your layout and required connection points. |
| 1/4-inch outside diameter |
Matches fittings designed for 1/4-inch OD nylon air brake tubing. |
| Black tubing |
Supports consistent line identification where black is specified. |
| DOT air brake construction |
Designed for air brake and air suspension plumbing with appropriately rated fittings. |
Technical specifications
| Specification |
Detail |
| Manufacturer and series |
Alkon DuraLink |
| Part number |
DL04BL50 |
| Tube outside diameter |
1/4 inch |
| Supplied length |
50 feet |
| Color |
Black |
| Material and construction |
Nylon; Type A |
| Wall thickness |
0.040 inch |
| Minimum bend radius |
1 inch |
| Maximum working pressure |
145 PSI; verify the complete assembly’s pressure and temperature limits for your application |
| Operating temperature range |
−40°F to +200°F |
| Tubing standards |
SAE J844 and DOT FMVSS 49 CFR 571.106 |
Before ordering
Air brake tubing and fittings must be selected as a compatible assembly. Do not treat the tubing’s maximum pressure and temperature as permission to operate every fitting or complete system at those limits. Confirm the allowable pressure at your actual operating temperature and use the lowest applicable component rating.
| Check |
What to confirm |
| Tube and fitting size |
Specify 1/4-inch OD tubing connections; 1/4-inch NPT identifies a different connection dimension. |
| Air brake or suspension service |
Confirm the application permits this tube size and Type A nylon construction. Use fittings approved for the tubing and service. |
| Routing and length |
Measure the complete run and required installation allowance; maintain at least a 1-inch bend radius and avoid kinks. |
| Operating conditions |
Check normal pressure, pressure peaks, temperature and exposure against the tubing, fitting and equipment requirements. |
| Installation parts |
Select the required fittings and supports separately. Follow the tubing/fitting and equipment installation instructions. |
Need help selecting the correct air brake tubing? Contact UnitedBuilt through online chat, email parts@unitedbuilt.com, or call 602-253-7750 with your tube size, required length and application.
