Bar's Leaks Head Gasket Fix combines antifreeze-compatible sodium silicate sealing liquid and various-size gasket-sealing particles to stop head gasket coolant leaks without draining the cooling system. For use on water-cooled gasoline and diesel engines, Heavy-duty formula works on aluminum and cast-iron heads and blocks; also repairs head gaskets, cylinder heads, intake gaskets, cracked blocks and freeze plugs, Compatible with virtually all types of antifreeze, including conventional silicate-based green and blue and extended-life red/orange and yellow (OAT/HOAT) coolant, Gasket-sealing particles penetrate gaps and cracks and harden to permanently stop leaks without draining the cooling system, 1 bottle treats up to a4-gallon cooling capacity

• Stops Block Leaks
• Seals Cracked Cylinder Heads & Block
• Repairs Blown Head Gaskets