boiler tube;Certificate:ISO9001-2000,PED, API, TS16949; Out diameter:19.05- ... -14mm Our main products' summary1) Cold drawn carbon seamless steel boiler tube2) Certificate:ISO9001-2000,PED, API, TS169493) Standard:ASTM A106 ... :T/T or L/C 9) Mini order:10 tons boiler tube (Tina)