DMS1B2/45D Safeseal B125 circular manhole cover 450mm diameter clear opening with 35mm frame depth Specification Stock code Range Overall frame (mm) Clear opening (mm) Frame depth (mm) Options My Wrekin DMS1B2/45D Safeseal Ø 550 Ø 445 35 Options Screw locking Neoprene seal Integral badging Safety grille Ventilation holes Flood and odour control plate Quantity Decrease quantity Increase quantity Reset quantity Download Features Indexed corners ensure correct orientation first time, every time. Indexed corners ensure correct orientation first time, every time. Labyrinth seal helps to prevent odour escapes and water ingress. Labyrinth seal helps to prevent odour escapes and water ingress. 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. Images