This is a quick guide to help you identify the size of the Storz Connection
of an existing adapter you may have.
To identify your Storz Connection size you need to measure the distance between the lugs, the following image shows this.
You can match up your Storz Connection using the following table.
| Storz Size | Distance between Lugs |
| 25 | 31mm |
| 38 | 51mm |
| 50 | 66mm |
| 65 | 81mm |
| 75 | 89mm |
| 90 | 105mm |
| 100 | 115mm |
| 125 | 148mm |
| 150 | 160mm |
Thread Sizes
Here is a chart to help identify thread sizes.
The Size Column is the BSP size and the Male & Female
Columns show the size in mm that you will see
when measuring across the thread.
| Size (BSP) | Male Thread (AG in mm) | Female Thread (IG in mm) |
| 3⁄4 inch (19mm) | 26.441 | 24.117 |
| 1 inch (25mm) | 33.249 | 30.291 |
| 1 1⁄2 inch (38mm) | 47.803 | 44.845 |
| 2 inch (50mm) | 59.614 | 56.656 |
| 2 1⁄2 inch (65mm) | 75.184 | 72.226 |
| 3 inch (75mm) | 87.884 | 84.926 |
| 4 inch (100mm) | 113.03 | 110.072 |
| 5 inch (125mm) | 138.43 | 135.472 |
| 6 inch (150mm) | 163.83 | 160.872 |