Yakhiwe ngezindlu zensimbi engagqwali kanye ne-cartridge yesihlungi izingxenye ezimbili, ukugeleza koketshezi noma igesi ku-cartridge yesihlungi kusuka ngaphandle kuya ngaphakathi, izinhlayiya zokungcola zivaleleke ngaphandle kwe-cartridge yokuhlunga, futhi isihlungi sigeleza sisuka maphakathi ne-cartridge, ngakho-ke. ukuze kuzuzwe inhloso yokuhlunga nokuhlanzwa.