1.Diameter:25-150mm or 1'' - 6'' 2. ISO2037,DIN, IDF, SMS, JIS 3.sight glass(sight glass,stainless steel sight glass) Stainless Steel Sight Glass1) Specification: 1/2"-6", applied to the stainless steel pipeline system 2) Material quality: SUS304, SUS316L3) Flux domination of pipeline: DN12.5-150MM and 1/2" - 6"4) Standards: ISO, DIN, SMS, IDF 5) Application: Pharmacy, beer, food, dairy, beverage ...