An AC booster for 22 systems! Drying agent Colder air Longer life A/C booster This product is a combination of 2 Enviro-Safe products mixed into 1 to promote maximum cooling performance. It will remove moisture from the AC system. As most people know, moisture = corrosion and corrosion lead to leaks. Nobody wants leaks in their AC system! This product also will reduce friction in system and provide colder air duct temps in most cases. These are 4oz cans.