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Older vehicles can develop leaks in their radiators and intake manifolds. If you’ve tried other stop leak products you know they are not powerful enough to stop larger leaks. That’s why Rislone designed this specific formulation. This one-step sealer was designed to quickly and safely stop these types of leaks.Our formula permanently repairs larger leaks in radiators, intake manifolds and gaskets, heater cores, blocks, heads and freeze plugs. It contains an antifreeze-compatible sodium silicate liquid glass formula, so no draining of the cooling system is required. It also will not harm the system when used properly.Other products can’t get your vehicle back on the road like Rislone — that’s why we’ve been the most trusted brand since 1921.
Rislone Liquid Copper Block Seal Intake/Radiator Stop Leak seals larger leaks regular stop leaks won’t
Seals larger leaks, repairs heater core leaks, freeze plus, blown head gaskets as well as repairs blocks
One step formula permanently repairs leaks in gaskets, radiators, heater cores, intake manifolds, blocks, heads and freeze plugs. Use on cars, trucks, vans, SUV’s and RV’s
One 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 antifreeze including conventional green or blue (Silicate-based) and extended life red/orange or yellow (OAT / HOAT) coolant
Size: 510 g