The Power Products 1/4" Air Brake DOT Push-In NP64 Union Tee keeps you Ready for the Road Ahead , permitting you to skip the use of installation tools with a simple Push To Connect (PTC) fitting. This brass union tee serves as a connector for the air brake tubing and is perfect to use for tight fit applications under the dash. Engineered as a full flow design, gain 60% better flow than standard compression fittings with inserts. This union tee 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 .