Concrete products and manholes
| Company | Website |
| Bluffton Precast Concrete | no website available |
| East Jordan Iron Woks | www.ejiw.com |
| Kerkstra Precast | www.kerkstra.com |
| L. F. Manufacturing, Inc. | www.lfm-frp.com |
| Ladtech, Inc. | www.ladtech.com |
| Northern Concrete Pipe | www.ncp-inc.com |
| Presfab, Inc. | no website available |
| Reliner/Duran, Inc. | www.reliner.com |
| Sealing Systems, Inc.-Infishield | www.ssisealingsystems.com |
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