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,
Cov neeg ua haujlwm pabcuam cov neeg ua haujlwm cov lus teb tau zoo heev, qhov tseem ceeb tshaj plaws yog cov khoom lag luam zoo heev, thiab ntim khoom kom zoo, xa sai sai!