DMT0D4/4545/KT Tristar D400 manhole cover 450mm x 450mm clear opening with 100mm frame depth Specification Stock code Range Clear opening (mm) Overall frame (mm) Frame depth (mm) Options My Wrekin DMT0D4/4545/KT Tristar 450 x 450 610 x 610 100 Options Screw locking Integral badging Ventilation holes Flood and odour control plate Quantity Decrease quantity Increase quantity Reset quantity Download Features The enlarged frame corners help to dissipate loads onto the foundation, providing a longer service life and increased reliability. The enlarged frame corners help to dissipate loads onto the foundation, providing a longer service life and increased reliability. Safety keyway prevents accidental disengagement of the lifting key during the handling process. Safety keyway prevents accidental disengagement of the lifting key during the handling process. 70+ PSRV tested at top surface of chequer by UKAS accredited 3rd party. 70+ PSRV tested at top surface of chequer by UKAS accredited 3rd party. Indexed corners ensure correct orientation first time, every time. Indexed corners ensure correct orientation first time, every time. Non rocking 3-point suspension design, for silent operation. Non rocking 3-point suspension design, for silent operation. Images