Description The Emco A0721-018 Monitoring Well Manhole 18 X 12 Grey Ductile Lid incorporate cast-in identification triangles in accordance with API recommendations. Key Features Painted ductile iron lid and rim Water-tight lid Custom skirt heights available Heavy Duty (16 gauge hot rolled carbon steel) skirts available. 100% welded skirt and seam. To order, replace the first digit of the variant number with a 2.