Hercules 1 Gallon Boiler Liquid

Features: Seals and repairs cracks and leaks in steam and hot water systems. This liquid formula will not clog hot water coils, controls, valves, or vents. Forms a tough seal that expands and contracts with heat. Resists high pressure and is not affected by boiler cleaners. No odors - no priming - no foaming. Does not contain petroleum distillates. Compatible with Hercules cryo-tek or other types of propylene glycol-based anti-freeze products, chemical additives and boiler treatment compounds. NSF registered/USDA authorized.