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
900mm x 900mm access
1200mm x 675mm access

Access Product Drawing Weight Pack size Pack weight
One-part
600 x 600mm 70kg 15 1050kg
675 x 675mm 53kg 15 795kg
750 x 600mm 66kg 10 660kg
750 x 750mm 80kg 10 800kg
900 x 600mm 75kg 12 900kg
600 x 600mm
(eccentric)
80kg 10 800kg
Two-part
600 x 600mm 48kg 15 720kg
675 x 675mm 56kg 15 840kg
900 x 900mm 50kg 10 500kg
1200 x 675mm 90kg 10 900kg
concrete seating rings - illustration
concrete seating rings - illustration 2

Lothian Seating Slabs
The Scottish Water seating slab or Lothian Seating Slabs (access opening size) is designed to comply with Scottish Water Services Specifications.

It is used in place of engineering bricks to adjust the ductile or cast-iron covers and frames to the required level.

Lothian Seating rings are not affected by moisture, fire or lose their shape in normal groundwater conditions.

Access Product Drawing Weight Pack size Pack weight
Lothian Seating Ring
675 x 675mm 280kg 5 1400kg

Seating Rings/Adjusting Units and Section 38 Agreements
Section 38 (Highways Act 1980) is the term for the legal agreement that allows a highway authority to “adopt” a road (meaning it will be maintained by the highways authority at the public’s expense) which has been constructed by a private developer for 5 or more dwellings.

The developer has to be able to prove that the road has been constructed in accordance with standards set out by the highways authority to enable the highways authority to be able to “adopt” it under a Section 38 legal agreement.

So in the case of concrete frame adjusting/seating rings; units manufactured to BS EN 1917 and BS 5911-3 are shown in both Manual of Contract Documents for Highways Works – Volume 3 – Highway Construction Details – F-Series and in Sewers for Adoption 7th Edition – they are therefore deemed to be accepted for use in highway construction and should not prevent a road from being “adopted” under a Section 38 agreement by a highways authority.

Note: Appearance of a hairline crack in a seating ring or gully cover does not signify failure or a cause for rejection.

Our multi-part adjusting units offer the advantage of light weight sections enabling one man to handle the units and comply with manual handling requirements.

All adjusting units/seating rings
It is the responsibility of the customer to check that the proposed cover and frame flange is fully supported by the chosen adjusting system as flange sizes may vary.

For more information call 01952 588 885