Terms of the Trade: What Is Pipe Dope? Terms of the Trade: What Is Pipe Dope?

Although it has a funny name, in plumbing the term pipe dope is used to refer to a lubricant or sealant that creates a tighter bond in pipe fittings when secured together. The idea is that the liquid fills in the threads of the piping and creates a leak-proof, pressure-tight seal.

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