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Amazon.com: DOT Air Brake Line Fittings Connector for Nylon Tubing 1/2", Brass Air Compression Nylon Hose Fitting with D.O.T Approved for Trucks Trailers and Industrial Repair(Pack 2) : Industrial & Scientific
Air Brake D.O.T. Compression Style Fittings for J844 Tubing - NTA | VS269NTA-10-8
90686 DOT Approved Male Connector, Compression Air Brake Fitting, Brass, 1/2" x 3/8" | Imperial Supplies
DOT Compression Run Tee (1/2" x 3/8" MPT, 10 Pack) - Advanced Technology Products
Tacoma Screw Products | 1/2" D.O.T. Air Brake Fitting for Nylon Tubing (Push-In) — Bulkhead Union