Sin Ling supplies a complete range of DOT air brake push-in fittings designed for inch-size tube ODs commonly used in North American commercial vehicles. These fittings are fully compliant with FMVSS 571.106 and engineered for use with SAE J844 Type A/B nylon air brake tubing.

Our inch tube OD offerings include 1/4", 3/8", and 1/2" sizes, which cover the majority of air brake, suspension, and pneumatic control systems on heavy-duty trucks and trailers. Each fitting is manufactured from high-quality brass and features a stainless-steel collet, reinforced tube support, and durable HNBR/NBR sealing options for long-term reliability.

Designed to withstand vibration, thermal cycling, and high-load operating conditions, these inch-size fittings ensure strong pull-out resistance and leak-free performance. Ideal for OEM, Tier 1 suppliers, and fleet maintenance applications, Sin Ling’s DOT push-in fittings deliver dependable performance for modern commercial vehicle air systems.