Enviro-Safe 1234YF ProSeal 3 oz with Hose Part#: 4845 1 can of Enviro-Safe 1234YF ProSeal 3 oz will treat 1 vehicle. It is an aerosol (pressurized) can. 1 hose - 134a can tap to R1234yf vehicle connection. This product has a R134 top. While this product is great for sealing punctures and leaks in rubber and metal, it will not fix mechanical issues!