sanitary check valve Material:AISI304,316L,321,304L,316 Size: DN25-150 & 1"-6" Sanitary female thread check valveManufacture standard: ISO, GB,DIN,3A,IDF etc.Material:AISI304,316L,321,304L,316 Pipeline flux domination:DN25-150&1"-6",applied to the stainless steel pipeline system.