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Bar's Leaks Liquid Copper Block Seal Intake & Radiator Stop Leak seals larger leaks regular stop leaks won't. One step formula permanently repairs larger leaks in radiators, intake manifolds & gaskets, heater cores, blocks, heads and freeze plugs. Use on cars, trucks, vans, SUV's and RV's. One "1" Step Sealer contains an antifreeze compatible sodium silicate liquid glass formula, so no draining of the cooling system is required. It will not harm the cooling system when used properly. Use with all types of 50-50 mix antifreeze including conventional green or blue (Silicate-based) and extended life red/orange or yellow (OAT /HOAT) coolant.

Product Features:

• 1 Step Sealer
• Antifreeze Compatible
• Permanently Repairs Larger Leaks
• Compatible Will All Types of 50/50 Mix Antifreeze