... , borosilicate sight glass, spars for level gauge. The series include: 1) Reflex glass 2) Transparent glass 3) Round ... sight glass 1) Reflex gauge glass Size: A4, A5, A6, A7, A8 ... 260 degree C, Working pressure: 4.0MPa 2) Plain gauge glass Size: A4, A5, A6, A7, A8, ... degree C, Working pressure: 6.3 MPa 3) Round gauge glass Thickness: 10mm-25mm Diameter: 50mm - 250mm Pressure ...