The Fernox LS-X Leak Sealer & Jointing Compound (50ml) is a versatile solution for sealing leaks in central heating systems, plumbing, and joints. It creates a durable, long-lasting seal that prevents water damage and system downtime. Ideal for use on threaded joints, flanges, and pipes, it helps maintain system integrity and ensures a secure, leak-free connection. LS-X is a proven, fast acting, silicone paste which is used as an effective external leak sealer and jointing compound. It is designed for use on hot and cold water services, including potable water. Ready to use, no mixing required. Non rigid setting so joints can be undone. Can be used on compression joints and threaded fittings. No shrinking or cracking. Suitable for use from below freezing point to above boiling point of water. Completely safe to use with drinking water. 50ml tube. LS-X from Fernox is a silicone paste which is a fast acting external leak sealer and jointing compound. For use on hot and cold water, including potable supplies, the compound is easy to use and once applied from the tube can be moulded using a suitable forming tool which is submerged in soapy water first to prevent sticking. Also used as a jointing compound it has a minimum 2 hour setting time which may vary depending on the thickness of application. Fibres may be used when used with larger pipe diameters or presst