... is optional 4.DN3,4,6,10 Company profile:CHANGZHOU CHENGFENG FLOWMETER CO.,LTD was established in 1979,at the begining our company ... : Contact Details:Vicky LvSales ManagerChangzhou Chengfeng Flowmeter Co.,LtdNo.15,Tongjia Industrial Park,Changzhou,Jiangsu Prov.,ChinaTel:86-519-85327611 Mob:86 ...