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Groove GI pipe ASTM A53 / A795 / BS1387 for fire fighting pipeline system with Victaulic coupling To meet our clients and market demand ,Website:http://www.hksteelpipe.com,we developed groove galvanized pipe,as one of our extended products basis on Huike pipe factory,our excellent grooving pipes have gained very good reputation from all over the world, especially for the galvanizing coating, we can do 100micro thickness by blowing way , size from 1/4'' up to 8'',this highly cater to some government projects which required high quality and long useful life.Quick details of hot dip galvanizing t