This rubber constructed sealing plug selection is for use for AC and refrigeration tubing. Depending of the type of installation these rubber hole plugs require, they feature tabs that are attached, and some have no tabs. They are used to help protect the tubing, and seal it when needed, such as when appliances are placed into storage and the tubes must be kept dry. If looking for other AC and refrigeration accessories beyond these expandable pipe plugs? Check out our refrigeration access valves and AC cleaners and scale removers.