- Each unit comprises two aluminium rails, expanded against the trench wall by a pair of interconnected hydraulic cylinders, which are available in a range of different sizes.
- The cylinders fit directly into a recess in the rails and are pressured by a small hydraulic hand pump, giving an uninterrupted column of strength between the trench walls.
- All units are designed for easy installation and removal by one or two people from outside the trench.
| | Type A | Type B | Type C | |
| Vertical Rail Length (mm) | | 1067 | 1524 | 2134 | |
| Minimum Excavation Width (mm) | | 450 | 450 | 450 | |
| Maximum Excavation Width (mm) | | 1600 | 1600 | 1600 | |
| Clearance Below Lower Cylinder (mm) | | 115 | 509 | 357 | |
| Weight (kg) | | 23 | 33 | 40 | |
1. Various cylinder sizes available with operating ranges in between the minimum and maximum width.
2. Weights based on maximum width.
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