Bar's Leaks Liquid Copper Block Seal Coolant Leak Fix Stop Leak seals larger leaks regular stop leaks won't. One step formula permanently repairs coolant loss problems on cars, trucks, vans, SUV's and RV's. Antifreeze compatible sodium silicate liquid glass penetrates large and small leaks in plastic, aluminum and cast iron heads, blocks, intake manifold and gaskets, freeze plugs, heater cores and radiators. Fiber additives lock together with liquid to increase strength and promote a permanent seal. It will not harm the cooling system when used properly, no draining is required. Use with ALL types of traditional or extended life coolant including yellow, orange, pink, red, blue, purple and green silicate based and non-silicate based (OAT/HOAT) 50-50 mix antifreeze, and/or water.

Product Features:

• Seals larger leaks!
• Repairs Heater Core Leaks
• Repairs Freeze Plugs
• Repairs Block Leaks