Hercules 1 qt. Boiler Liquid is used to seal and repair cracks and leaks that appear in steam and hot water systems. The odor-free formula creates a tough seal that expands and contracts with heat. NSF registered and USDA authorized.
- Seals and repairs cracks and leaks in steam and hot water systems
- Compatible with propylene glycol-based antifreezes, chemical additives and boiler treatment compounds
- Will not clog hot water coils, controls, valves or vents
- Resists high pressure and is not affected by boiler cleaners