The SMC DOT Bulkhead Unions are great fittings to use when running air lines into a false floor or from the interior of your vehicle to the exterior. These fittings are DOT approved and feature a metal sleeve which helps align the air line inside of the fitting, providing an improved seal.
For an easy install, check out our SMC DOT Bulkhead Drill Bit
Drill bit sizes for installation:- 1/4" bulkhead - 15mm or 9/16" drill bit
- 3/8" bulkhead - 23mm or 7/8" drill bit
- 1/2" bulkhead - 26mm or 1" drill bit