Description
Brass DOT push-in union tee fittings (Midland 6404-series) for nylon air-brake tubing. Three-port quick-connect tee in sizes from 1/4″ through 3/4″ tube OD — drop-in service replacement for any DOT-rated push-in tee on tractor/trailer air systems. Meets DOT FMVSS 571.106 and SAE J1131 air-brake-system requirements.
Specifications
| Manufacturer | Midland Industries |
|---|---|
| Part Numbers | 640400 (1/4″), 640600 (3/8″), 640800 (1/2″), 641000 (5/8″), 641200 (3/4″) |
| Part Type | DOT Push-In Union Tee (Air Brake) |
| Material | Brass |
| Tube OD Sizes | 1/4″, 3/8″, 1/2″, 5/8″, 3/4″ |
| Ports | 3 (tee — straight-through union with branch port) |
| Standards | DOT FMVSS 571.106 / SAE J1131 |
Applications
Branching DOT-approved air-brake tubing on Class 6-8 tractors, trailers, and vocational trucks where a tee splice is needed in the supply or service line. Compatible with standard nylon DOT air-brake tubing in the listed OD sizes.
Select the variant matching your tubing OD. All three legs of the tee accept the same tube size.
