... &1"-6" 3)ISO9001:2000 4)SMS,DIN,3A,ISO 10 years,1000pcs per week,sanitary stainless steel check valve Features:sanitary stainless ... steel check valve1)Material :SS304,304L,316,316L2)Size:DN25 ... .6)connnection type:welded,clamped,flanged,threaded sanitary stainless steel check valve