• A-Lok Products

• Advanced Drainage Systems

• Artisan Painting

• Atlantic States Cast Iron Pipe Co.

• Blankenship Heating & Cooling Inc.

• Brocar Products

• Cambridge Seven Associates, Inc.

• Campbell Foundry Co.

• Carr Concrete Corp.

• Cherne Industries

• Composite Structures, Inc.

• Contech Construction Products Inc.

• Copeland Corporation

• Diamond Plastics Corporation

• Diamond Plastics Corporation

• EJ

• FE Myers

• Gorman-Rupp Company

• Granite Construction Co of Utah

• Gym-Con Ltd.

• Hancor

• Hardy Holzman Pfeiffer Associates

• Hoffman Air & Filtration Systems

• Insituform Technologies

• J.L. Turner Co.

• Jay R. Smith Mfg. Co.

• Lafarge Calcium Aluminates

• Logan Clay Products Co.

• Monsey Bakor Inc.

• Neenah Foundry Co.

• Norstar Industries

• Patterson Pump Co.

• Perkins Pryde Kennedy + Steevensz

• Poly-Wall International, Protective Coatings Technology, Inc.

• Press-Seal Gasket Corporation

• Pro-Tech Weatherproofing, Inc.

• Purestream

• Robert Oldham Ltd.

• Roediger Pittsburg

• Smith & Loveless

• Steamist

• Strom Plumbing by Sign of the Crab

• TRUEBRO

• The Harrington Corporation (HARCO)

• Tyler Pipe

• U.S. Foundry & Mfg. Corp.

• USFilter

• Vandex

• Vulcan Foundry

• Waterloo Biofilter Systems

• Wyoming Concrete Products