... quartz products Co., LTDProductmaterial:stainless steel flangefeature :Stainless Steel Sight Glass1 Material: SUS304,SUS304L,SUS316,SUS316L2 Flux domination of ... pipeline: DN25-DN200 & 1''-8''3 Standards: DIN, SMS, ISO, IDF, 3A, ... lead time and guaranteed qualityOEM serivce:YESSpecifications:Stainless Steel Sight Glass1) 1/2"-6"&DN10-150 2) 3A,DIN,SMS, ...