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 khoom siv raw khoom zoo no ruaj khov thiab txhim khu kev qha, ib txwm ua raws li cov kev cai ntawm peb lub tuam txhab los muab cov khoom zoo raws li peb cov kev xav tau.