D.O.T. (Department of Transportation) approved Push to Connect fittings are the most commonly used connection in air brake applications. The compact style of a Push to Connect fitting is well suited for installing in confined areas. However D.O.T. regulations require all nylon tubing air brake connections have fittings with an inner tube support. The tubing slides into the fitting and the metal inner tube support slides into the tube. This provides a more solid connection for over the road air brake systems.
- Remove burrs on the end of the pipe which can cut into the O-ring and make slight serrations where the fitting collar will slide on to allow for an adequate grip.
- Ensure that the Push to Connect fittings are recommended and approved for the application.
- Because there are so many types of these fittings, make sure to reference and follow the manufacturers’ instructions to ensure a tight seal.
- Some Push to Connects require a special tool to remove the fitting. The tool will typically come with the fitting, so be sure to use it instead of attempting to force it off the tube or pipe.
The chart below outlines the fitting selection process between Push to Connect and compression fittings.
Push to Connect fittings are much easier to use compared to compression fittings. And they are more practical than permanent solvent-gluing CPVC and PVC pipes or sweat-soldering brass pipes with a torch in general plumbing applications. These fittings have proven to provide highly reliable connections even when they are hidden behind panels or other enclosed areas. When making joints for new installation or repair using brass tube, PEX or CPVC, Push to Connect fittings are the easiest and fastest method to provide an air or fluid tight seal when the tube or pipe is inserted.