Understanding Pipe Fittings

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Metal pipes sections may also be joined and built up as pipelines using pipe couplings and other standard black malleable iron pipe fitting such as metal pipe end caps or 180-degree pipe elbows.

Nonferrous
Aluminum fittings are typically cast. They are available in all the same forms or shapes as steel fittings. Aluminum threaded fittings such as caps or nipples are available, as are fittings that feature a combination of threaded and butt weld connection styles. Socket weld options also exist. Welding of aluminum fittings usually requires a MIG or TIG process.