Next Day Delivery Available
Next Day Delivery Available
Order before 3:30pm for Next Day Delivery!
Available Monday-Friday
Fernox F4 EXPRESS Fernox F4 Aerosol Leak Sealer 400Ml
Couldn't load pickup availability
Available now at Heatparts: Fernox F4 Express Leak Sealer 400ml – a genuine, non-flammable aerosol solution designed to seal small, inaccessible leaks and weeps in central heating systems. Utilising Barrier Pressure Pack technology, it delivers a quick and efficient seal without the need for system drain-down. Effective within 1–24 hours, it prevents blockages in sensitive components like pumps and heat exchangers. Suitable for systems up to 130 litres (16 radiators or 250 m² of underfloor heating). Available for next day delivery.
Fernox F4 EXPRESS Fernox F4 Aerosol Leak Sealer 400Ml is backordered and will ship as soon as it is back in stock.
We Only Stock Genuine Parts.
Buy with Confidence at Heatparts
Payment & Security
Payment methods
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.