Oatey 30115 Hercules Boiler Liquid Stop Leak, 1-Quart. From the Manufacturer. Seals and repairs cracks or leaks in steam or hot water heating boilers. Prevents steam boiler surging and will not clog or coat submerged hot water heating coils, controls, vents or valves. Makes a strong, lasting repair on difficult leaks in steam boilers.
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