I-Choke manifold iyithuluzi elidingekayo lokulawula ukukhahlela nokusebenzisa ubuchwepheshe bokulawula ingcindezi yemithombo kawoyela negesi. Uma isivimbeli sokuvuthela sivaliwe, ingcindezi ethile ye-casing ilawulwa ngokuvula nokuvala i-throttle valve ukuze kugcinwe ukucindezela kwembobo engezansi kuphakeme kancane kunokucindezela kokubunjwa, ukuze kuvinjwe uketshezi lokubunjwa ukuthi lungagelezi emthonjeni ngokuqhubekayo. Ngaphezu kwalokho, ukuminyanisa okuphindaphindiwe kungasetshenziswa ukuze kuncishiswe ingcindezi ukuze kuvele ukuvaleka okuthambile. Lapho ingcindezi yomthombo ikhuphuka ifike emkhawulweni othile, isetshenziselwa ukufutheka ukuze kuvikelwe umthombo. Lapho umfutho womthombo ukhula, uketshezi olusemthonjeni lungakhululwa ukuze lulawule ukucindezela kwe-casing ngokuvula nokuvala i-valve ye-throttle (i-manual adjustable, i-hydraulic ne-fixed). Lapho ingcindezi ye-casing iphezulu kakhulu, ingaqhuma ngokuqondile nge-valve yesango.