• Dutco Tennant LLC, PO Box 233, Dubai, U.A.E.
Ultima Civil Infrastructure
Ultima Roads & Utilities

STAKKAbox™ ULTIMA offers a flexible access chamber system with no compromise on strength. Due to the design and the material used (GRP), ULTIMA should be used anywhere where sidewall loading is a concern, such as alongside highways or railway tracks.

ULTIMA chambers are constructed by stacking 150mm deep ring sections to reach the desired height. Each ring section is castellated to positively interlock with the unit above and below. Due to the sectional twinwall design and the GRP material, most ULTIMA 150mm deep sections fall under 25kg in weight, making it suitable for a single person lift under manual handling regulations.


  • Fast and Easy to Install
  • Sectional & Twin Wall Design
  • Flexible During Installation
  • Smooth Outer Walls with Lip to ‘Key In’
  • High Strength to Weight Ratio
  • Fire Retardancy
  • Variability in Size