Penberthy Reflex Glass For Level Gauge,Size 9...Function: Insulated Glassshape: Flatstructure: Solidtechnique: Clear Glass, Tempered Glasstype: Sheet Glass, Tempered Glassmaterial: Borosilicatesize: Plainapplication: Boiler & Otherscomposition: Toughened Glassworking Pressure: 4 To 8.0 Mpaspecial Size: Optionalworking Temperature: 260 °C" .Dimensions : 33x4x2 cms.