The Fernox F4 Leak Sealer 500ml is a white, eco-friendly liquid designed to seal underfloor and central heating systems. Made from metal, this storage tank water heater is suitable for indoor use with a tank capacity of 75-150 litres. With an energy efficiency rating of A+++, this product is perfect for those looking to improve the efficiency of their boiler heating system. Made in the United Kingdom by the trusted brand Fernox, this leak sealer is a reliable option for sealing and maintaining your heating system.
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