M1188 Square-Edged Round Manhole Cover for Highways (Alternative) C250 Category: 2 > 1 C250 58+3 Automatic
M1217 Heavy-Duty Square-Edged Round Manhole Cover for Highways D400 Category: 2 > 1 D400 62+3 Automatic
M1339 Fully Round General Pattern Highway Manhole Cover D400 Category: 2 > 1 D400 42 ± 2 Manual and Automatic
M1339A Six-Hole Round Manhole Cover for Highways D400 Category: 2 > 1 D400 42 ± 2 Manual and Automatic
M930 Heavy-Duty Rectangular Metallic Chimney Cover for Airports and Ports F900 Category: 2 > 2 F900 150+10 Automatic
M109 Fully Sealed Square Manhole Cover for Fuel Stations (Alternative) D400 Category: 2 > 4 D400 63+3 None