1.Brass Holding Ring Resilient Gate Valve New type DIN3352 F4 2.guarantee the quality 3.give you satisfactory ... ,DIN3352-F4,F5,AWWA C509 and socket end resilient gate valve, BS750 Hydrant, BS5153(L/W)copper seal swing check valve, BS5163 ... and so on. Brass Holding Ring Resilient Gate Valve New type DIN3352 F4