One Piece Units
Cover frame adjusting units are reinforced 65mm deep units which are used in place of engineering bricks to adjust the ductile or cast iron covers and frames to the necessary level and are kitemarked to BS EN1917:2002/BS5911-3:2010
The advantages of adjusting units are:
-All concrete manhole units can be ordered from one source
-There is a reduced risk of on site damage and pilferage
-They can be quickly and easily installed by semi-skilled labour
-There are fewer joints which reduce the likelihood of infiltration
Visit the Marshalls CPM website for more information on Adjusting Units/Seating Rings