Borosilicate reflex glass / reflex sight glass Its made from Borosilicate, it is used in lever gauge in boiler for water position. It is also named: Reflex Gauge Glass, Sight glass, Reflex Glasses, Reflex sight glass, Spares For level Gauge The category is as follows: 1) Three tendons (four grooves) 2) Two tendons (three grooves) Sight glass/gauge glass - three tendons (four grooves) 340 x 34(30) x 17mm, 320 x 34(30) x 17mm, 280 x 34(30) x 17mm 250 x 34(30) x 17mm, 218 x 34(30) x 17mm, 190 x 34(30) x 17mm 165 x 34(30) x 17mm, 140 x 34(30) x 17mm, 115 x 34(30) x 17mm 400 x 34 x 17mm, 370 x 34 x 17mm, 300 x 34 x 17mm 400 x 34 x 17mm, 370 x 34 x 17mm, 300 x 34 x 17mm The other size is optional or according to the requirements of customers. Working temperature: 260 degree C, Working pressure: 4.0MPa Sight glass/gauge glass - two tendons (three grooves) 340 x 34 x 17mm, 320 x 34 x 17mm, 280 x 34 x 17mm 250 x 34 x 17mm, 218 x 34 x 17mm, 190 x 34 x 17mm 165 x 34 x 17mm, 140 x 34 x 17mm, 115 x 34 x 17mm 280 x 34 x 22mm, 280 x 28 x 17mm, 250 x 34 x 20mm 250 x 34 x 22mm The other size is optional or according to the requirements of customers. Working temperature: 260 degree C, Working pressure: 4.4MPa Packing: each piece in a box and then in carton.