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,
Tus neeg muag khoom ua raws li txoj kev xav ntawm "zoo qhov yooj yim, ntseeg thawj thiab tswj cov qib siab" kom lawv tuaj yeem ua kom ntseeg tau cov khoom lag luam txhim khu kev qha thiab cov neeg siv khoom ruaj khov.