Fernox F4 Express 400ml Central Heating Leak Sealer 62422

Fernox F4 Express 400ml Central Heating Leak Sealer 64222. Can be dosed easily via a filling loop or TF1 system filter. With this product, you will save time draining down and also repairing. The formula is safe to use as it is environmentally friendly and non-toxic. It will not cause blockage in pipework, pumps, air vents and heat exchangers. It is quick and easy to use and does not have to be drained down the system. It only takes 30 seconds to dose and will ensure all leaks are sealed. It works by finding the area of oxygen ingress and forms a polymer to seal the pinhole. There is no risk of air ingress into the system as the compressed air is not mixed with the active product.