Fernox F4 Leak Sealer - 500ml

Fernox F4 central heating leak sealer:

• Is ideal for reducing pressure loss from sealed systems
• Seals most weeps and small inaccessible leaks
• Saves time and money on draining down and repairing
• Does not cause blockages of pump, air vents etc.
• Compatible with all metals and materials commonly used in central heating systems