Wrekin Products has created GritBlocker; a solution to blocked keyways, which can encourage unsafe removal methods of manhole cover lids and lead to wasted time on site. Manhole cover lids are removed by inserting and rotating the correct key into the keyway before safely lifting the lid from the frame. However, keyway pockets often fill with debris such as grit and stones, which prevents the use of the lifting key. This makes it more likely...
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