Mukamagwira ntchito, tsekani magulu awiri a ma valve owunika ndi ma valve oyenerera.Ngati kuwunika kuli kofunika, ingodulani ma valve othamanga kwambiri ndi ma valve otsika kwambiri, tsegulani valavu yoyendera ndi ma valve awiri owunika, ndiyeno mutseke valavu yoyendera kuti muyese ndikuwongolera chotumizira.