Boss White is a classic pipe jointing paste formulated for sealing metallic threaded joints in heating and general service pipework. It spreads smoothly, adheres well to threads, and helps create a reliable, pressure-tight seal that resists water and steam. Widely used by installers for non-potable systems, it’s suited to heating circuits and other general applications where drinking-water approval is not required. Note: Boss White is not recommended for potable (drinking) water connections—choose a potable-approved alternative where required.