Heavy Duty & Medium Manhole Cover      Typical Section   Heavy duty C.J. circular opening manhole cover with black bitumen coating, load tested up to 350kn to SIRIM Standars.    Single piece circular cover, single seal medium duty C.J. circular opening manhole covre with black bitumen coating hinged together.    All dimension are in mm Clear Opening B  Base Size C x D Depth E Total Mass Kg Heavty Duty 600 840 x 840 152 240 Medium Duty 600 840 x 840 102 125