... "-12".AISI304,AISI316L. 3.DIN,SMS,ISO,IDF,AS,BS,BPE Standard Stainless Steel Seamless Pipe (ISO9001:2008,CE, ... 400G),inner surface mechanical polished Ra less than 0.4 - 0.8μm, outer surface glass polished Ra ... less than 0.8μm. Standard: DIN, SMS, ISO, IDF, ... sight glass,manhole cover,cleaning ball,centrifugal pump,pipe holder etc... Order requirements 1.Quantity and ...