All units are tested and produced where possible in accordance with the relevant provisions of BS EN 1917:2002/BS 5911-3:2002 (but are not kitemarked).
The precast concrete chamber sections are supplied with 50mm diameter holes for lifting purposes and can be supplied with or without double step rungs/integrated ladder system.
Advantages of system include:
Less sealant required
Fewer connecting bolts than a segmental shaft
Speedy installation
Smooth bore requiring no secondary lining
Fewer joints than a segmental shaft
Visit the Marshalls CPM website for more information on DN3660/4000 Chambers