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| Material |
Concrete |
| System components |
Seating rings |
| Cross section |
Square |
Concrete frame adjusting / seating rings are reinforced 65mm deep units which can be used in place of engineering bricks to adjust the ductile or cast iron covers and frames to the required level.
They can be quickly and easily installed by semi-skilled labour and there are fewer joints which reduce the likelihood of infiltration.
Multi-part adjusting units offer the advantage of lightweight sections enabling one man to handle the units.
Manhole seating rings are manufactured to BS 5911-3 standard in the following sizes:
One-part seating rings:
600mm x 600mm access
675mm x 675mm access
750mm x 600mm access
750mm x 750mm access
600mm x 600mm eccentric
Two-part seating rings:
600mm x 600mm access
675mm x 675mm access
