|--- flanges ------------- slipon, threaded, lap joint, blind flanges --- socket weld flanges ------------------ weld neck flanges
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|--- elbows ------------- forged socket weld elbows ---------------- forged threaded elbow --------------- butt weld elbows
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|--- tees ----------------- forged socket weld tees ------------------- forged threaded tees ------------------ buttweld tees
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|--- reducers ----------- butt weld reducers
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|--- caps ---------------- forged socket weld caps ------------------- forged threaded caps ----------------- butt weld caps
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|--- stub end
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|--- laterals
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|--- nipples ------------- forged threaded nipples -------------------- forged threaded swaged nipples
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|--- couplings ---------- forged socket weld couplings ------------- forged threaded couplings
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|--- outlets ------------- socketed outlets ( sockolets ) -------------- threaded outlets (threadolets ) ------- welded outlets ( weldolets )
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|--- union --------------- forged socket weld union ------------------ forged threaded union
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|--- boss ---------------- forged socket weld boss ------------------ forged threaded boss
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|--- plug & bushing ---- forged threaded plug & bushing