Pipe Jointing Compound
Also known as: Boss White, Fernox LS-X, jointing paste, hemp and paste
Paste applied to threaded connections — typically alongside hemp fibre on water and heating pipes — to create a flexible, permanent seal that can withstand movement and vibration.
Applied to male threads on water and heating connections, especially on gas fittings (use approved compound only).
White or grey paste supplied in a tin or tube.
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Always turn off the water supply before replacing any part. If in doubt, consult a qualified plumber. Gas components must only be worked on by a Gas Safe registered engineer. Unvented (pressurised) hot water systems must be worked on by a G3-qualified engineer. Prices shown are indicative — check retailers for current pricing.