FER-62422 | Leak Sealer F4 Express (aerosol) 400ml Type:Leak Sealer This prepares the system for

This prepares the system for the addition of an inhibitor

Extra Strength Remover is a strong acidic cleaner for the removal of stubborn cement and grout residues

a gentler but still highly effective solution to this common problem

It is ideal for providing a water repellent

FER-62422 | Leak Sealer F4 Express (aerosol) 400ml Type:Leak Sealer This prepares the system forEasy application method: Fernox F4 Leak Sealer Express 400ml is designed for a quick, simple, and hassle free application. With its unique pressurized canister, it can be directly introduced into a heating system without the need for draining or disassembly, saving time and effort. Seals small leaks effectively: This product is specifically formulated to seal small, inaccessible leaks and weeps which can cause pressure loss in your central heating