• Wheatland Tube Company

• Abresist Corporation

• Air Plastics

• Ameron International Corp.

• Asahi/America, Inc.

• Astro Arc Polysoude

• Augusta Fiberglass

• BF Goodrich

• BG Consultants Inc.

• BOC Gases

• Bittner Industries

• Bridges PBT

• Cobra Pipe Supply

• Colonial Engineering, Inc.

• Conine Mfg. Co.

• Copeland Corporation

• Corbel Design, Inc.

• Creative Systems

• Diamond Plastics Corporation

• Earl Swensson Assoc., Inc. (ESa)

• George Fischer Inc.

• Hampshire Co.

• Heimbuck Welding & Ornamental Iron

• Insituform Technologies

• Joseph Davis

• Kraissl Co.

• Millennium Industrial Manufacturing, Inc.

• Mueller Mist Irrigation Co.

• Pathway Bellows

• Perma-Pipe

• Plast-O-Matic Valves

• Plastronics

• Plexco

• Rebecca Schunck Wallpaper Installation and Removal

• Rovanco Piping Systems

• Schuster Mechanical

• Smith Fiberglass

• Stormwater Management

• T-DRILL Industries Inc.

• Thermacor Process

• Tilton Kelly Bell

• Victaulic Co. of America

• William L. Myles & Sons

• Woodard Custom Painting, Inc.