Welcome to our new online store!

Next Day Delivery Available

Order before 3:30pm for Next Day Delivery!

Available Monday-Friday

SKU: F4 EXPRESS

Fernox F4 EXPRESS Fernox F4 Aerosol Leak Sealer 400Ml

£21.21
Shipping calculated at checkout.

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.


We Only Stock Genuine Parts.

Buy with Confidence at Heatparts

Payment & Security

Payment methods

  • American Express
  • Apple Pay
  • Diners Club
  • Discover
  • Google Pay
  • Maestro
  • Mastercard
  • PayPal
  • Shop Pay
  • Union Pay
  • Visa

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.

Heatparts

Fernox F4 EXPRESS Fernox F4 Aerosol Leak Sealer 400Ml

£21.21

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.

View product