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Weld on collar for high wear-resisting hardening of the product, the product is high abrasion resistance and its advantage than ordinary pipe fittings of long service life of 3-4 times.Moreover,the materials of it are alloy steel,stainless steel and carbon steel etc.Also the facing method of it are rust preventing oil, spray paint (black, yellow), hot galvanization, cold galvanization or colored electroplate, powder coating and so on.