NOT FOR USE IN AMMONIA SYSTEMS! Metal sealer for leaks in a/c condensers, evaporators, line sets and solder joints. Proseal XL4 is used in home, heat pump and industrial applications. One can will normally repair a leak in systems up from 1.5 to 5 ton. If you have a smaller unit, please contact us. If the a/c system is low on pressure, you need to pull a vacuum or you can use the Enviro-Safe Prodry XL4. The reason for the vacuum or the use of Enviro-Safe Prodry XL4 is that it will eliminate moisture in the system. Moisture causes corrosion and nobody wants that in their system! If using the Enviro-Safe Prodry XL4 with the Proseal XL4, you do not need to empty the system to pull a vacuum. For larger units over 5 tons, we suggest you use the Enviro-Safe Proseal XL4 Direct Inject.
