Check the listing for details. Refrigerant ProSeal for R1234yf, EnviroSafe Sealant, R1234 ProSeal, 3 CANS. Condition: New. Listed at 51.99 USD. Each and every year it is common to replace the lost refrigerant that leaks out over the winter months. This procedure is very costly and annoying and adds to the negligible affects to our environment with global warming. Our line of Proseal products offers leak protection that lasts for years! ProSeal is perfect for finding and sealing those pesky leaks in your R1234yf system 1 can of Enviro-Safe R1234YF ProSeal 3 oz will treat 1 vehicle. Proseal R1234YF is gas-charged for easy installation and is fully compatible with R1234YF systems. This product is pressurized. The can itself has a R134 top on it as shown in the picture so you will need a hose with a R134 top tap and R1234yf vehicle connection.Each and every year it is common to replace the lost refrigerant that leaks out over the winter months. This procedure is very costly and annoying and adds to the negligible affects to our environment with global warming. Our line of Proseal products offers leak protection that lasts for years! ProSeal is perfect for finding and sealing those pesky leaks in your R1234yf system 1 can of Enviro-Safe R1234YF ProSeal 3 oz will treat 1 vehicle. Proseal R1234YF is gas-charged for easy installation and is fully compatible with R1234YF systems. This product is pressurized. The can itself has a R134 top on it as shown in the picture so you will need a hose with a R134 top tap and R1234yf vehicle connection.