... , UL for structure, fluid, conduit, sprinkler system,fence tubing galvanized pipe, including ERW and Seamless, round and rectangular or square, aew ... . PURPOSE: fence tube, structural tube, scaffolding tube, water transferring tube, oil pipe, casing pipe, sprinkler fire fighting system tube (with groove available), EMT conduit ... and so onCERTIFICATE: ISO9001, UL, FM, CE,JIS,API galvanized pipe