Enviro-Safe ProSeal XL4 R-134a R-12 R-22 Leak Stop 4 oz Can;

Must be shipped to a physical address. We will not ship to P.O. boxes. ProSeal XL4 is designed for repairing leaks in condensors, evaporators, copper line, and solder joints. This product is an epoxy that reacts to water and air. When coming in contact with the atmosphere, it forms a seal over the leak. If your system stays charged for one day when running, this product will fix most leaks that you encounter. If there is air and water in your system, pull a deep vacuum on the system and boil moisture out of the system. An alternative to pulling a vacuum is to purchase and use ProDry XL4 to turn moisture into synthetic oil. This will prevent ProSeal from reacting inside your system. In most cases. if a system has not leaked below 15 psi, there is tpically not air or moisture in the system. The system has greater pressure than what the atmospheric pressure is and cannot leak unless the system is below 15°. ProSeal XL4 has twice as much sealing agent as regular ProSeal. It is great for repairing those reoccuring leaks in systems. Save on costly repair and use ProSeal XL4 instead. Made for large systems (5 ton a/c's)