Seller notes

Heavy Duty Block SealerMixes with all types of antifreezeWill not plug heater coreSafe for plastic and aluminum unitsMakes a permanent sealRust inhibitorHapco Heavy Duty Block Sealer is guaranteed to stop existing block leaks fast! Our formula does not contain metal flakes, is compatible with all types of antifreeze, will not plug the heater core and is safe for all cooling systems. Specially formulated to permanently seal and protect against future leaks. Also safe to use for radiator and head ...

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