---Easy 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 system. It's an ideal solution for hard-to-reach places where manual intervention is difficult. ---Non-toxic and safe to use: The Fernox F4 Leak Sealer is composed of non-toxic, environmentally friendly materials. It's safe for prolonged exposure to the system's components and doesn't pose any risks to the health of homeowners or technicians.
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