... series include: 1) Reflex glass 2) Transparent glass 3) Round sight glass 1) Reflex gauge glass Size: A4, A5, A6, A7, A8, A9 ... , A10, A11 B4, B5, B6, B7, B8, B9, B10, B11 The other size is ... . Working temperature: 260 degree C, Working pressure: 4.0MPa 2) Plain gauge glass Size: A4, A5, A6, A7, A8, A9, A10, A11 B4 ...