Fernox F4 leak sealer 500ml (formerly LSI)

£22.49

Seals small leaks and weeps which may cause pressure loss and/or boiler breakdown.

An 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 water treatment chemical has been proven to prevent blockages or restrictions within the boiler or vulnerable system components such as pumps and safety devices.

A leak can be quickly and efficiently sealed, without the need for a complete system drain down.

* Ideal for reducing pressure loss from sealed systems

* Seals most weeps and small inaccessible leaks

* Compatible with all metals and materials commonly used in central heating systems#

* One 500ml recyclable bottle treats up to 130 litres of system water (16 radiators) and the equivalent of 250m2 of underfloor systems.