The Power Products 1/4" Air Brake DOT Push-In Straight NP62 Union ensures you are Ready for the Road Ahead , allowing you to skip the use of installation tools with a simple Push To Connect (PTC) fitting. This brass union serves as a connector for the air brake tubing and is perfect to use for tight fit applications under the dash. Simply push in, for easy use and saving you valuable time in getting your air brake system up and running. Engineered as a full flow design, gain 60% better flow than standard compression fittings with inserts. This union is approved for most air brake applications, except for frame to axle installation, and between towed and towing vehicles. FleetPride is your First Click in Heavy Duty .