... boiler for water position. It is also named water Gauge Glass, level gauge glass, boiler sight glass, liquid indicator glass, borosilicate ... sight glass, spars for level gauge. The series include: 1) Reflex glass 2) Transparent glass ... 260 degree C, Working pressure: 6.3 MPa 3) Round gauge glass Thickness: 10mm-25mm Diameter: 50mm - 250mm Pressure: 6 ...