Impera ya stub ikoreshwa buri gihe hamwe na lap ifatanye, nkumugongo winyuma.Stub irarangirabikozwe muburemere busanzwe bwurukuta, kandi buraboneka mubunini buri hagati ya 1/2”kugeza kuri 48”.Ibipimo bya stub birangirana no kwihanganira ibipimo bisobanurwa mubisanzwe ASME B16.9.Ibiro byoroheje byangirika byangirika (Fittings) bisobanurwa muri MSS SP43.Impera ya stub iraboneka muburebure bubiri.MSS (Uburebure busanzwe) na ANSI (Uburebure burebure).