Liquid Copper Block Seal

Liquidcopperblockseal 10081368
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The reformulated Liquid Copper Block Seal Intake and Radiator Stop Leak permanently seals larger leaks in gaskets, radiators, heater cores, intake manifolds, blocks, heads and freeze plugs.

  • Uses an advanced antifreeze-compatible sodium silicate liquid glass formula that works with all types and brands of antifreeze
  • Can be used in any water-cooled vehicle
  • One 18-oz. bottle treats cooling systems up to 6 gal.
  • Will not harm the cooling system when properly installed, or clog the system or heater core
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