Seating Rings/Adjusting Units

Milton Precast cover frame adjusting units 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 and are kitemarked to BS EN1917:2002/BS5911-3:2010

Adjusting units are available for the following access sizes (mm)
Note: 600x600 Eccentric/Corbel units have an eccentric opening which is used inconjunction with a 750x600 cover slab opening

 600x600  675x675  750x600  600x600

 The advantages of adjusting units are:

  • They can be quickly and easily installed by semi-skilled labour.
  • There are fewer joints which reduce the likelihood of infiltration
  • All concrete manhole units can be ordered from one source
  • There is a reduced risk of on site damage and pilferage
Diameter Depth Weight (kgs)
600x600 65 70
675x675 65 65
750x600 65 70
750x750 65 80

Two piece adjusting units are now available with a 600 x 600 or a 675 x 675 opening and offer the following advantages:

  • Each section weighs less than 25kg enabling one man to handle the units and comply with manual handling regulations.
  • No requirement for bricklayers due to ease of installation.
  • Quicker to install than brickwork.
Diameter Depth Weight (kgs)
600x600 65 48
675x675 65 60

Scottish Water Seating Slab

Special seating slabs 1125 x 1125 x 150mm thick, to comply with Scottish Water Services Specification are available with access sizes 600 x 600, 675 x 675, 750 x 600 and 750 x 750.

Tel: (01795) 425191
Fax: (01795) 420360

Milton Pipes Limited, Milton Regis, Sittingbourne, Kent. ME10 2QF