I-tubs ezinomtsalane zibonakaliswa ngokuchaneka kwabo okuphezulu kunye nomphezulu wangaphakathi. Zenziwa ukusuka kwintsimbi yenqanaba eliphezulu, ephantsi kwenkqubo engqongqo yokufezekisa ubuchule obuchanekileyo. Le nkqubo ayihlaziyi kuphela indawo yangaphakathi kodwa iphucule iipropathi zeTube zoomatshini, zenza ukuba kube boneke kwaye kuxhathise uxinzelelo oluphezulu kunye nokunxiba. Iityhubhu ezinezinwele zisetyenziswa ngokubanzi ekwenzeni iisilinda ze-hydraulic, apho zisebenza khona njenge-cylinder barrel, zivumela ipiston ukuba ihambe kakuhle ngaphakathi kubo.
Bhala umyalezo apha kwaye uthumele kuthi