Sorry, the web browser you're using is not supported by this website.

Please use Google Chrome, Firefox, Safari, or another browser to access Thank you.

Skip to main content

We use cookies to enhance your experience. For details on how we use cookies, collect data, & how to manage your consent please see our Cookie Policy & Privacy Policy.

How do you use fernox f4 central heating leak sealer?

If you want to ensure that no treated water is thrown away, pour the Leak Sealer F4 into the tank and then draw off the water from the drain cock. All Leak Sealer F4 needs to be absorbed into the circulating system.

Let's Get It Fixed!

Our virtual experts can diagnose your issue (for free!) and resolve simple problems.

What Did You Think of This Article?

What Did You Think of This Article?

Shop Recommended ProductsShop HomeX Recommended Products