inzwa yeleveli yoketshezi yethangi likawoyela nethangi lamanzi isebenzisa umgomo wezibuthe ukuze ilawule ukucisha nokuvalwa kwepayipi lasentwasahlobo, iguqule ukuguqulwa kwezinga loketshezi elilinganisiwe libe okukhipha isignali kagesi futhi lixhumane nethuluzi, ukuze libone ukuphakama kwezinga le-liquid.