Check the listing for details. Borosilicate Flat Tri-Clamp End Cap Sight Glasses For Extractor Lids. Condition: New. Listed at 55.00 USD. Borosilicate Tri-Clamp Sight Glasses For Extractor Lids ***Note:(Only comes with 1 sight glass.)4 piece borosilicate sight glasses offer a greater chemical resistance, viewing area, and cleanability compared to a traditional sight glass such as polycarbonate or Metaglas sight glasses. These Tri-Clamp sight glasses consist of 4 pieces: the borosilicate glass disc, Viton gasket, tri clamp viton gasket and custom tri-clamp ferrule. When used in combination with high-pressure clamps the working PSI is rated at 800 ***Disclaimer: Please handle with care when installing on to a system and do not overtighten or the glass disc may chip.Sizes Available:1.5" Tri-Clamp2" Tri-ClampFerrule Material304 Stainless SteelGlass MaterialBorosilicateGasket MaterialViton(FKM)Connection Type(s)Tri-ClampPSI Rating800