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,
Lub tuam txhab no tuaj yeem ua tau raws li peb cov kev xav tau ntawm cov khoom lag luam thiab lub sijhawm xa khoom, yog li peb ib txwm xaiv lawv thaum peb muaj kev yuav khoom.