Type:SG-ZT11-29 Brand:WeiFeng Size Range:1/4"Inch to 4"Inch Body&Cap&Flapper&Spring Material:Carbon Steel(WCB),304/316/316L Stainless Steel Seal Material:PTFE(White)/NBR(Black)/Graphite(Black) Sealing Gasket Window Material:Tempered Glass/Quartz Glass/Borosilicate Glass/Aluminosilicate Glass Pressure Level:1.6MPa-5.0MPa Temperature Level:-30掳C to 100掳C;-50掳C to 200掳C/1000掳C End Connection:NPT,BSPT(RC),BSPP(G) Female Thread. Application Medium:Liquids,Gases,Petroleum,Solid Liquid and Water etc. Packing Method:Carton Box or Plywood Box Delivery Time:Within 10 days for 100 pieces Product Warranty:One Year without man-made destructionSight Glass in stock website:http://www.alvifeng.com/sight-glass/