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Stub End (180 mm Long) Mfg Range : 32 mm OD to 315 mm OD A stub end, also known as a lap joint stub end, is a type of pipe fitting used in piping systems. It is designed to be used with lap joint flanges, and it is used to create a joint connection where one end of the stub end is welded to the pipe, and the other end has a lap joint flange that can slide over the pipe and be bolted to a matching flange. The "180M" designation you mentioned is not a standard or common terminology in the context of stub ends or pipe fittings. In the context of stub ends, the "M" might be an abbreviation for "Male," which could indicate that one end of the stub end has male threading. However, it's important to note that without more context or specific industry standards, it's difficult to accurately determine the meaning of "180M" in this context. Stub ends are often used in applications where there is a need for periodic dismantling or maintenance of the piping system. The stub end and lap joint flange combination allow for easy disassembly without the need to cut and re-weld the pipe. This can be particularly useful in situations where the pipe needs to be frequently disconnected or where there is a requirement for quick installation and removal. If you have specific requirements or standards in mind, it's recommended to consult relevant piping and plumbing codes or industry guidelines to ensure accurate and safe usage of stub ends in your specific application.