... : Sanitary Sight GlassType: Welded endsMaterial quality: AISI304, AISI316LStandard: DIN, ISO, 3A, IDFSpecification: DN25-DN100 & 1"-4", applied to the stainless steel ... kinds of sanitaryvalves and fittings. Such as butterfly valves, check valves, ballvalves, diaphragam valves, sample valves, stop reversing valves, reliefvalves, bends, tees, reducers, unions, ferrules, etc ...