- Balco, Inc.
- Manufactures of expansion joint systems, photo luminescent products, stair nosings, floor mats and grids, trench and access covers, grates and frames, as well as exterior expansion joint systems.
- Bass & Hays Foundry, Inc.
- Manufactures municipal type manholes, frames and grates.
- Deeter Foundry, Inc.
- Producing gray iron castings for all segments of the construction industry, including manhole frames and covers, storm sewer inlet frames, grates and curbs, trench grating and tree grates.
- Doug Meadows Company, LLC
- Manhole cover extractors, manhole risers and no flow in flow manhole inserts.
- Ducast Factory L.L.C
- A ductile iron and steel foundry, manufacturing municipal and engineering castings for various applicaton.
- Hern Iron Works
- Manufactures sprockets, manhole covers, boiler parts, sawmill castings, other cast iron products or even cannons.
- Knappco Corporation
- Specialized manufacturer of industrial access ports, manholes, hatches, coamings, collars, weld rings and fill covers.
- LeBaron Foundry, Inc.
- Manufacturer of municipal castings, frames, covers and grates.
- Manhole Systems, Inc.
- Manufactures American made, high quality steel adjustable manhole riser rings.
- Neenah Foundry Company
- Supplier of quality gray and ductile iron municipal and industrial castings.
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