My Wrekin

GritBlocker - Anti-blockage keyway insert

Access to underground chamber systems is often achieved by lifting manhole cover lids; inserting lifting keys into their keyways, then lifting the lids from the frame and placing them on the pavement surface near the chamber opening. 

Problems With Existing Assets

  • Manhole lid keyway pockets can often be filled with debris which prevents the insertion of a lifting key to such an extent that operatives attempt other unsafe methods of lid removal. 
  • Significant time can be wasted on site by operatives attempting to clear keyways enough to allow key insertion, particularly where covers have not been accessed for long period.

The Solution

Fortunately, we have solved this common issue with a simple, but effective remedy: an anti-blockage keyway insert which fills the lid keyway pocket with a material that prevents detrimental debris ingress, but allows the insertion and rotation of a lifting key.

This ensures that operatives can always gain access to the keyways, allowing them to follow safe practices when lifting manhole covers.

GritBlocker anit-blockage keyway insert


GritBlocker installer in Wrekin Highway keyway

GritBlocker benefits

Inhibits debris from entering keyway

Reduces operative time in carriage way

Can be installed on virtually any cover