... fittings Widely used in the connection of the industrial pipelines for the Petrochemical, Gas and Oil pipes, Electrical Power, Food, etc ... .Type:Equal Tee ,butt welded and seamless. (others)Used for : petroleum,chemical,power,gas,water,linepipe, heat exchanger,shipbuilding,construction ... certificate : ISO 9001:2008Marking :according to client's requirement. hydraulic cold forged tee fittings