Amagwiritsidwa ntchito kwambiri pakutalikitsa chubu, kulowetsa mitundu yambiri yamankhwala nthawi imodzi komanso kulowetsedwa mwachangu. Zimapangidwa ndi ma valve atatu ogwiritsira ntchito zamankhwala, njira ziwiri, kapu yanjira ziwiri, njira zitatu, chowongolera chubu, chowongolera, chofewa. chubu, jekeseni gawo, cholumikizira cholimba, likulu la singano(malinga ndi makasitomala'chofunikira).