sanitary sight glass,stainless steel sight glass Specification:1"-4", applied to the stainless steel pipeline system Materi sanitary sight glass, stainless steel sight glassDetailed Product Description Specification:1"-4", applied to the stainless steel pipeline system Material: SS304, SS316L Standard: 3A, DIN, ISO Application: beer, food, dairy, beverage, cosmetics, pharmacy and chemical etc ...