Fernox Leak Sealer F4 Express 400 ml (aerosol) 62422 screwdriver When used in conjunction with

When used in conjunction with Cleaner F3 gas savings of up to 15% can be achieved every time you heat your room

Domed Bullet

The TF1 Total Filter has been designed to ensure there is minimal pressure loss whilst continuing to maintain a high collection efficiency

Unique fold-out panels for easy access

Fernox Leak Sealer F4 Express 400 ml (aerosol) 62422 screwdriver When used in conjunction withFernox Leak Sealer F4 Express 400 ml (aerosol) 62422 Leak Sealer F4 is a internal leak sealer developed for use throughout a central heating system to seal small, inaccessible leaks and weeps which may cause pressure loss and boiler breakdown. Once dispersed within the system, the product finds the area of oxygen ingress and forms a polymer to seal the pinhole. Effective within 1 24 hours after application, the unique sealing efficiency of this market