HITELFI – Sight Glass
| Type | Max Pressure | Max Temperature | Glass | Fluids |
| See Through | 30 kgf/cm²g | 300°C | tempered | requirements |
| Flapper | 30 kgf/cm²g | 300°C | tempered | requirements |
| Ball | 30 kgf/cm²g | 300°C | tempered | requirements |
| Lantern | 7 kgf/cm²g | 200°C | hard | requirements |
| High Pressure | 120 kgf/cm²g | 300°C | tempered | requirements |
| Wiper | 107 kgf/cm²g | 200°C | hard | requirements |