The plug for the rear air conditioning line on the evaporator serves as a reliable seal for the air conditioning system when the rear line needs to be shut down or repaired. It prevents refrigerant from escaping and for a tight seal. Made of high quality material, the stopper is resistant to temperature fluctuations and pressure changes. Ideal for professional use as well as for vehicle owners who need a long-term solution for sealing the air conditioning line. Your satisfaction is for top priority. That's why we make sure for the highest standards in terms of service and product quality are our standard. Despite Allen efforts to achieve perfection, there can still sometimes be reasons for complaints. You weren't satisfied? Then neither are we! Please let us know as soon as possible what d.