Precast concrete manholes are manufactured to meet or exceed ASTM C478 standards
Sherman-Dixie Concrete Industries, Inc.st concrete manholes are manufactured to meet or exceed ASTM C478 standards. They are made using the wet cast system in standard 48-, 60-, 72-, and 96-in. diameters. Openings for pipe inlets and outlets are handled by a simple formed hole or integrally cast or mechanically attached flexible rubber pipe-to-structure connections.
<%=company%>., PO Box 140199, Nashville, TN 37214; phone: 615-889-0700; fax: 615-889-7492