- Based on designs developed for the NGS bench mark
- Used to provide a protective cover for sectional rod monuments like those used for geodetic control or GPS
- Fits over 5" (127 mm) PVC pipe or inside standard* 6" (152 mm) Shedule 40 PVC pipe
- Heavy-duty design with significantly more material at critical points
- Stronger and fully recessed hinge
- Suitable for use in pavement areas such as streets or highways, as well as open land
- Weighs about 2.5 pounds (1.3 kg)
- Available with a tamper-proof screw that requires a special tool to open