A/C AC Metal Line Splice Repair Kit for 5/16" O.D. A/C Line Splice Repair Kit Fits 5/16" O.D. Metal Lines Replacing metal lines can be labor intensive, time consuming, and costprohibitive Fast, durable repair for A/C, heater, transmission, and power steering lines 5-Minute Metal Line Repair Solution Durable Leak Repair with No Line Removal