Cov hmuv cawv yog lub npias thoob qhov hluav taws xob valve, siv rau lub thoob npias, ua ke nrog lub thoob caj dab xov foob, thiab nrog tib hom filling kab thiab dispenser,
Peb tau koom tes nrog lub tuam txhab no tau ntau xyoo, lub tuam txhab ib txwm ua kom cov khoom xa tuaj raws sijhawm, tus lej zoo thiab raug, peb yog cov koom tes zoo.