Technical Specifications
| Model | AT11 | AT12 |
| Open Center, Inch (mm) | 24.5 (622) | 21.5 (546) |
| Close Center, Inch (mm) | 18.5 (470) | 15.5 (394) |
| Stroke , Inch (mm) | 6 (152) | 6 (152) |
| Cylinder Bore, Inch (mm) | 1.5 (40) | 1.5 (40) |
| Model | AT11 | AT12 |
| Open Center, Inch (mm) | 24.5 (622) | 21.5 (546) |
| Close Center, Inch (mm) | 18.5 (470) | 15.5 (394) |
| Stroke , Inch (mm) | 6 (152) | 6 (152) |
| Cylinder Bore, Inch (mm) | 1.5 (40) | 1.5 (40) |