Fernox F4 Express Central Heating Leak Sealer - 400ml

The Fernox F4 Express is a 400ml central heating leak sealer designed to quickly seal leaks in heating systems. Ideal for emergency repairs and maintenance.

Key Specs

• 400ml bottle for multiple applications
• Quick-acting formula to seal leaks rapidly
• Compatible with all types of radiators
• Helps to prevent system pressure loss
• Easy to use - simply add to the system

This leak sealer will help you maintain the integrity of your central heating system.