Most failures in tubing occur from abrasion or corrosion. Generally it is only a small area of the tube that fails. Tube kits minimize downtime making permanent repairs without removing the assembly. The D.O.T. tube kits have a variety of fittings and brass bushings to adapt for various port sizes. Although they are for D.O.T. nylon tubing they can be used on copper, aluminum, or thermoplastic tubing. The 5/16 kit is for non-D.O.T. applications. The steel tube union kits repair fractional and metric hydraulic tubing in both light and heavy series.