Bar's Leak Block Seal Intake & Rad Stop Leak

ATP's Bar's Leak Block Seal Intake & Radiator Stop Leak is a liquid copper-based additive designed to seal minor coolant system leaks without the need for mechanical repairs. This product is ideal for field operators managing aging vehicle fleets or maintaining equipment in remote deployments, providing a quick solution to restore coolant system integrity.

Packaged in an 18 oz bottle, this additive works by conditioning existing coolant to expand and form a permanent seal around small fractures and gasket weeping in radiators, water pumps, intake manifolds, and freeze plugs. It is formulated to be compatible with all conventional antifreeze types, including green, orange, pink, and blue, and effectively targets ferrous metals found in engine blocks and radiator cores.

One 18 oz bottle treats a typical light to medium-duty cooling system, while larger systems may require two bottles. Application is straightforward: pour directly into the radiator with the engine cool, then run the engine at operating temperature to circulate the additive. This product is most effective on slow seeps and minor weeping rather than active stream leaks, making it a valuable tool for overland operators and fleet maintenance personnel.