S.U.R. & R.'s A/C Line Repair 5/16" repair fittings can be used to make on-the-car repairs to damaged rubber and aluminum lines including pinholes, cracks and kinks. Includes a compression block off fitting for use on SUV's and vans with leaking lines or failed rear A/C components. Featuring advanced compression union and hose adapter technology, all connections are made by hand and tightened with the use of a standard wrench. Other benefits include all-alluminum construction to avoid corrosion and double seal compression union technology.