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Seal small, inaccessible leaks and weeps in a central heating system with Fernox F4 Leak Sealer. There is no need to drain down the system before use, and once dispersed, it will be effective 1 to 24 hours after application.
- Ideal for reducing pressure loss from sealed systems
- Proven to seal most weeps and small inaccessible leaks
- Time saving - no need to drain down the system
- Does not cause blockages of pumps and air vents
- Compatible with all metals and materials used in heating systems
- Can be left in the system permanently