Ipayipi lokubhoboza, iyinsimbi engenalutho, izindonga ezincane, insimbi noma i-aluminium ingxubevange yamapayipi asetshenziswa emishinini yokumba.Ayinalutho ukuvumela uketshezi lokumba lumpontshwe phansi ngembobo ngebhithi bese lusekela i-annulus.Iza ngobukhulu obuhlukahlukene, amandla, nokuqina kodonga, kodwa ngokuvamile ingamafidi angama-27 kuye kwangama-32 ubude.Ubude obude, kufika kumafidi angu-45, bukhona