Imininingwane enzuzo
Indlela yokuthumela:ukulethwa kwe-express
Ukubonisa umlingani
Amavalvu ahlukanisayo avimba ukugeleza endaweni eyodwa ngokuphepha futhi angavuzi futhi ngesikhathi esisodwa avumela ukugeleza kwamahhala kolunye uhlangothi (hlola ama-valve, ama-valve okugcwalisa kuqala kanye nama-valve okuvala).
