A ½” universal connector is used to connect two pieces of ½” tubing in order to extend the length of tubing. You can also use it to patch a big hole in ½” tubing, by cutting out the hole and connecting the two ends of tubing with the connector. All tubing ranging from .520" to .620" I.D. can be used with this fitting. The Power-Loc design allows for an easier and smoother installation process.