Beer Fitting------Welded Sight Glass,Sanitary Sight Glass,W/W Sight Glass SS304,SS316L DIN,SMS,3A DN25-DN100,1"- ... 4" Beer Fitting------Welded Sight Glass,Sanitary Sight Glass,W/W Sight GlassMaterial:SS304,SS316LStandard:SMS,3A,DIN,ISO,IDFSize:DN25 ... us know. Beer Fitting------Welded Sight Glass,Sanitary Sight Glass,W/W Sight Glass