Boss White Pipe Jointing Compound (200g) is a, non-toxic, lead-free, non-hardening white paste used to create secure, leak-proof seals on threaded, non-drinking water pipes. It works on hot/cold water, low-pressure steam, and gas, providing lubrication for assembly and easy future disassembly. It is widely used in plumbing for metal, stainless steel, and copper pipes, often applied with an olive for compression fittings.