Steel pipe tee Executive standards: GB, HGJ, SHJ, SY, DL, ISO, ANSI, JIS, and DIN.    Certification of ISO9001:2000 since 1999. We hold many Chinese patent rights Nominal size(welded):     DN250...DN1600              (seamless):         DN250...DN1600 Wall thickness:     2.0-50mm It would be a pleasure if we can prepare our products for your prosperity!