Prestone AS145Y Radiator Stop Leak, 11 Ounce Bottle, Slurry, Slight Azole, 1 Each

Prestone Radiator Stop Leak features a patented formula that quickly stops leaks in radiators, water pumps, and heater cores while also protecting against pitting and corrosion. Prestone Radiator Stop Leak takes sealing performance to a higher level by both stopping the leak as well as the corrosive condition that causes leaks in the first place. Its unique combination of natural and synthetic components provides the ability to seal leaks up to 0.020-inches x 0.5-inches. What makes this possible is the size, strength, and durability afforded by fibrous particles, the same materials in bulletproof vests. Prestone Radiator Stop Leak particles have been chosen to seal even large leaks without interfering with the flow through the radiator and heater core tubes. It also boosts corrosion inhibitors to protect against pitting and corrosion, which cause radiator leaks.

Prestone® Radiator Stop Leak’s patented formula quickly stops leaks in radiators, water pumps and heater cores while also protecting against pitting and corrosion. Unique combination of natural & synthetic components provides the ability to seal leaks up to 0.016 x 0.5. What makes this possible is the size, strength, & durability afforded by fibrous particles, the same materials in bulletproof vests.Size: 11 OzUnique combination of natural & synthetic components provides the ability to seal leaks up to 0.016 x 0.5What makes this possible is the size, strength, & durability afforded by fibrous particles, the same materials in bulletproof vestsSeals even large leaks without interfering with the flow through the radiator & heater core tubesBoosts corrosion inhibitors to protect against pitting & corrosion, which cause radiator leaksInstructions:With engine off and cool, shake well and add entire contents to radiator and fill with Prestone® 50/50 Antifreeze/Coolant. For systems larger than 12 quarts, use two bottlesRun engine at the highest heater setting for 10 minutes after reaching normal operating temperatureTurn off, allow to cool. Fill with Prestone 50/50 Antifreeze/Coolant. Check fluid frequently, top off as necessaryNote:Do not use in a dirty or partially clogged radiator. Use Prestone® Flush + Cleaner first.