A weldolet is a fitting you weld on a (run) pipe, and then butt weld a branch pipe to it.
A tredolet is a fitting you weld on a (run) pipe, and then screw a threaded branch pipe to it. Some people call this a threadolet
A sockolet is a fitting you weld on a (run) pipe, and then socket weld a branch pipe to it.
A nipolet is the same as a weldolet or thredolet but has an elongated branch connection. You have to specify if it's a welded or threaded nipolet.
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