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| sockolet (O-lets. Purchased fittings, o-lets have one end shaped to the contour of the header and the other end manufactured to accept the type of end connections being used on the branch. Weldolets are manufactured for butt-weld fittings. Sockolets are made for socket-weld fittings. And threadolets are available for screwed fittings. (Pipe drafting and design / Roy A. Parisher, Robert A. Rhea-2nd ed. Malexey) | |||