Levelgauge 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) 3) plan transparent 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 ípc, working pressure: 4.0mpa. 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; Transparent plane 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; 216 x 34 x 17mm; Paper box