We got you covered™ with manhole rings & grates of cast gray or ductile iron. Standard manhole sizes and styles are stock items. ADA pedestrian style and bolted grates may be available on special orders. Open areas listed in grate descriptions (flow data must be calculated by a professional qualified engineer) Specify genuine American made quality products from Bass & Hays! Please use the Contact Form or call us to request info & submittal sheets. 1-800-258-2278 Toll Free (972) 263-1360 DFW Local.