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 Hoobkas tuaj yeem ua tau raws li cov kev xav tau ntawm kev lag luam thiab kev lag luam, kom lawv cov khoom tau lees paub thiab ntseeg tau, thiab yog vim li cas peb xaiv lub tuam txhab no.