DMS HEAT SYSTEMS IND. TİC.A.Ş. Our company, which started to serve in the natural gas sector in 2004 with the vision of "Everything about natural gas", has also started to produce all kinds of Flexible Stainless Gas Connection Hoses for Residential and Industrial uses under the OPEX brand. Our company continues on its way with its dynamic, quality staff and effective service principle in order to closely follow current innovations and demands, expand its product range, become one of the leading companies in the sector with new investments, and meet customer satisfaction and demands with developing technology.