Qhov no yog lub hauv paus ntawm peb lub pob valve, peb muaj cov pob valve ua los ntawm ntau cov ntaub ntawv. Piv txwv li, muaj PPR pob valve, tooj liab pob valve, PVC pob valve, PP pob valve thiab lwm yam. Hais txog cov tub ntxhais, peb kuj muaj ob yam khoom, tooj liab thiab cov tub ntxhais hlau. Koj tuaj yeem xaiv cov khoom raws li koj xav tau.
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