... ,3A,IDF 3)DN20-150,1"-6",or required Stainless steel Sanitary Welded Check Valve 1.SS304,SS316,SS316L,CF8M,or required 2.ISO ... ,DIN,SMS,3A,IDF 3.DN20-150,1"-6",or required •Stainless steel ... Sanitary Welded Check Valve•Material quality: SUS304, SUS316,SUS316L,CF8M,or required•Standard ...