Yuav Ua Li Cas Txheeb Dub Yeeb Nkab Hlau Kub Thiab Kub Daj Galvanized Steel Yeeb Nkab?

Cov xim ntawm cov yeeb nkab. Cov yeeb nkab dub steel yog cov ntshiab dub, thaum cov yeeb nkab galvanized yog nyiaj thiab grey;
Pipe Galvanized steel yeeb nkab siv raudejkev thauj mus los, thaum cov hlau dub yeeb nkab siv raumob ncauj plab.