Bar’s Leaks has reformulated its popular Liquid Copper Block Seal Intake and Radiator Stop Leak to make it the only one-step copper block seal on the market. Simply pour it into the radiator, idle the engine for five minutes, cool, top off with coolant and go. Liquid Copper (p/n 1109) uses an advanced antifreeze-compatible sodium silicate liquid glass formula so no draining of the cooling system is required. It works with all types and brands of antifreeze, and is available in six packs.