This chemical leak sealer is a viscous liquid formulated for repair use within central heating systems. It is supplied in a 400 ml container and designed to address fluid loss by forming a seal at leak points in system components.

Fernox F4 Express Leak Sealer 400 ml, 62422

This chemical leak sealer is a viscous liquid formulated for use in central heating systems to address leaks within radiators, pipes and boilers. Supplied in a 500ml container, it is intended as a targeted fluid treatment to limit weeping and seepage in closed heating circuits without requiring system dismantling.

Fernox F4 Leak Sealer 500 ml, 56603

This chemical leak sealer is a compact paste formulated for sealing leaks in hot and cold water systems. Supplied in a small 0.05kg form, it is designed for use where a fast, site‑ready sealing medium is required. The product is presented as a paste suitable for plumbing environments, enabling targeted application to service pipework and associated wet components.

Fernox LS-X Leak Sealer 0.05 kg, 61016

Looking for fernox leak sealer? Order from Wolseley today - free delivery or click and collect available nationwide.

Fernox Leak Sealer