high-density polyethylene yeeb nkab fittings

Nrog rau acceleration ntawm urbanization, tsoos hlau thiab cov kav dej ua vaj tse tau nyuaj ua kom tau raws li cov kev xav tau ntawm cov dej niaj hnub no vim yog corrosion, leakage thiab lwm yam teeb meem. Nrog nws cov khoom tshwj xeeb…