I-pie ye-pile yentsimbi yenziwe nge-carbon okanye ipleyiti yentsimbi, iiplate, iiprofayili, ukuya kwimo ethile enokwenza umsebenzi (Guqula umgaqo-nkqubo we-fluids okanye ireyithi) kwiinkqubo ze-piholi. Mostly these fittings includes steel elbow (45 or 90 degree bend), tee, reducer (concentric or eccentric reducer), cross, caps, nipple, flanges, gasket, studs and etc.