• A.P.I.C.

• ACE Hose & Rubber Co.

• ADALET-PLM

• ADEVCO Corporation

• Abresist Corporation

• Acorn Engineering Co.

• Admiral Steel

• Advanced Elastomer Systems

• Air Plastics

• Alamo Iron Works

• Alberts Painting, Inc.

• Allied Tube & Conduit

• Alltemp Products Company Ltd.

• Alro Co.

• American Cast Iron Pipe Co.

• American Granby

• American Metal Products - A Masco Co.

• Ameron International Corp.

• Andersen Mfg

• Anderson Metals Corp.

• Asahi/America, Inc.

• Astro Arc Polysoude

• Auheng Industries Co. Ltd.

• BF Goodrich

• BG Consultants Inc.

• Barber-Webb Co., Inc.

• Bershad Design Associates

• Bete Fog Nozzle

• Bittner Industries

• Boundary Fence & Railing System

• Bramec Corp.

• Brandenburg Industrial Service Co.

• Brass Craft Mfg

• Braun & Steidl Architects, Inc.

• Brenelle Co. LLC

• Brocar Products

• Bull Moose Tube Co.

• CLOW Water Systems Co.

• CPI Sales

• Cal Tube Industries

• Cantex

• Cement Lining Co.

• Central Sprinkler Company

• Cla-Val Canada Ltd.

• Cla-Val Co.

• Clow Canada Division of Canada Pipe

• Cobra Pipe Supply

• Colonial Engineering, Inc.

• Conine Mfg. Co.

• Conley Corporation

• Copeland Corporation

• Copper Development Association Inc.

• Creative Systems

• Crown-Line Plastics

• Dana/Everflex

• DeZURIK/Copes-Vulcan - Canada

• Diamond Plastics Corporation

• Diamond Plastics Corporation

• Diamond Water Systems

• Dormont Mfg. Co.

• Duraline

• Earl Swensson Assoc., Inc. (ESa)

• Elkem Materials Inc.

• Energy Automation Systems, Inc.

• Farr Associates

• Fisher Friedman Associates

• Flowserve Corp.

• Freedom Plastics, Inc.

• General Rubber Corp.

• George Fischer Inc.

• Global Industrial

• Griffin Pipe Products Co.

• H. D. Hudson Manufacturing Company

• Heatlink USA

• Heimbuck Welding & Ornamental Iron

• Higginson Equipment Sales Ltd.

• Hollaender Mfg. Co.

• Hydra-Zorb Co.

• I W Industries

• IDEX Corporation

• Infiltrator Systems Inc.

• Insituform Technologies

• J. G. Braun Co.

• J.L. Turner Co.

• Jet Stream Plastic Pipe Co.

• Johnson & Sons

• Joseph Davis

• KBI

• Kemco Systems

• Laclede Steel Co.

• Leer Electric Inc.

• Lewis Pipe Co.

• Loyalist Forest

• M A Stewart and Sons Ltd.

• MG Piping Produts Co.

• Mercer Rubber Co.

• Merrill Manufacturing

• Midland Metal Mfg. Co.

• Miscellaneous Metals, Inc.

• Morrison Bros. Co.

• Moultrie Manufacturing Company

• Mueller Industries, Inc.

• Murphy-Rodgers

• Murray Corp.

• NIBCO

• National Conveyors Company, Inc.

• National Roof Drainage

• Naylor Pipe Co.

• Neles-Jamesbury Ltd.

• NewAge Industries, Inc.

• Nicholson Steam Trap

• Noble Trade

• Nordstrom Valves Inc.

• Northern States Metals

• Oetiker

• Omega Engrg.

• Orion Fittings

• Perma-Pipe

• Plastinetics

• Plastronics

• Plexco

• Plumberex Specialty Products

• Power Plant Supply Company

• Precision Plumbing Products

• Pyramid Industries

• R & B Wagner

• Rebecca Schunck Wallpaper Installation and Removal

• Red Valve Company, Inc.

• Reliable Auto Sprinkler Co.

• Repcor

• Robvon Backing Ring Co.

• Roof Products & Systems Corporation

• San Pedro Mesquite Company

• Scully Signal Co.

• Selkirk Metalbestos

• Shaw Aero Development

• Smith Fiberglass

• Smith-Miller + Hawkinson

• Spears Manufacturing Company, Inc.

• Stamped Fittings

• Stockham Valves & Fittings

• Strom Plumbing by Sign of the Crab

• Superlon Plastics Co. Inc.

• T-DRILL Industries Inc.

• TRUEBRO

• Tex-Tube Company

• The Ford Meter Box Company, Inc.

• Thomas & Betts Electrical

• Thomas C. Wilson, Inc.

• Thompson Plastics

• Tilton Kelly Bell

• Tim A. Risley & Associates

• Townsend Associates

• Trent Tube

• Triad Boiler Systems

• Tuf-Tite

• Tyco Engineered Products & Services

• Tyler Pipe

• U.S. Foundry & Mfg. Corp.

• URS Corporation

• Uhl Construction

• Unaflex

• Unistrut Corp.

• Vanguard Piping Systems

• Victaulic Co. of America

• Water Technology, Inc.

• Watts Radiant

• Weather-Matic

• Wenzhou Nanlong Import & Export Trading CO., LTD.

• Western Pneumatics

• Wheatland Tube Company

• Wiest Rentals & Sales

• Wirsbo Co.

• Wolverine Brass

• Woodard Custom Painting, Inc.

• Woodbrier Associates, Inc.

• Zy-tec Global Industries