• AMTROL, Inc.

• Abresist Corporation

• Accusonic Technologies Inc.

• Acryline USA, Inc.

• Advanced Thermal Systems

• Ai/Washington, DC

• Air Plastics

• Alcore Fabricating Group

• Alley, Williams, Carmen & King, Inc.

• Alltemp Products Company Ltd.

• Alro Co.

• American Boa

• American Foundry Mfg. Co.

• American Standard

• Ameron International Corp.

• Ammark Corporation

• Anamet Canada Inc.

• Armstrong-Lynnwood, Inc.

• Asahi/America, Inc.

• BF Goodrich

• BG Consultants Inc.

• Badger Industries

• Boundary Fence & Railing System

• Brady Corporation

• Brass Craft Canada Ltd.

• Brocar Products

• Burren Painting

• CPV Mfg.

• Canvil Ltd.

• Cement Lining Co.

• Cherne Industries

• Cla-Val Co.

• Clow Canada Division of Canada Pipe

• Cobra Pipe Supply

• Conine Mfg. Co.

• Copper Development Association Inc.

• Creative Systems

• Customweld Industries

• Danos & Curole

• Discount Fence Co. Inc.

• Earl Swensson Assoc., Inc. (ESa)

• Elbex Corporation

• Engineered Air

• Farr Associates

• Flex-Hose Co.

• Flex-Weld Incorporated

• Flexicraft Industries

• Flowserve Corp.

• Garlock Sealing Technologies

• Genova Products

• George Fischer Inc.

• Global Industrial

• Griffin Pipe Products Co.

• HAYWARD Industrial Products, Inc.

• Heimbuck Welding & Ornamental Iron

• Hempfield Foundries Co.

• Higginson Equipment Sales Ltd.

• Hodes Company

• Hollaender Mfg. Co.

• Hubbard Enterprises

• Hydro-Flex Inc.

• I W Industries

• ITT Fluid Handling

• Infiltrator Systems Inc.

• Insituform Technologies

• J-M Manufacturing Co., Inc

• J.L. Turner Co.

• Jay R. Smith Mfg. Co.

• Josam Co.

• Joseph Davis

• Kemco Systems

• Kraissl Co.

• L.S.P. Products Group

• Leonard Valve Co.

• Loyalist Forest

• M A Stewart and Sons Ltd.

• Mason Industries, Inc.

• Mercer Rubber Co.

• Merrill Manufacturing

• Midland Metal Mfg. Co.

• Moen Inc.

• Mueller Steam Specialty

• National Conveyors Company, Inc.

• Naylor Pipe Co.

• Nellcor Puritan-Bennett

• Nicholson Steam Trap

• OPW Engineered Systems

• Omega Engrg.

• Orion Fittings

• Parker Hannifin

• Pathway Bellows

• Penn Separator Corp.

• Perma-Pipe

• Piping Technology & Products

• Plastinetics

• Plastronics

• Plumberex Specialty Products

• Precision Painting Co

• Precision Plumbing Products

• ProSet Systems, Inc.

• Proco Products

• Radiator Specialty Company of Canada Ltd.

• Rebecca Schunck Wallpaper Installation and Removal

• Red Valve Company, Inc.

• Rolatape Corp.

• Rosen's Electrical Equipment Co.

• Rovanco Piping Systems

• STEMCO Inc.

• Senior Flexonics (Canada) Ltd.

• Seton

• Smith-Miller + Hawkinson

• Sparco

• Specialty Forest Products, Inc.

• Spirax Sarco Canada Ltd.

• Spirotherm

• Sportmaster

• Strait Manufacturing & Welding, Inc.

• Strom Plumbing by Sign of the Crab

• Superlon Plastics Co. Inc.

• Symmons Industries Inc.

• T-DRILL Industries Inc.

• TRUEBRO

• The Metraflex Company

• Thermacor Process

• Tilton Kelly Bell

• Tyco Engineered Products & Services

• Tyler Pipe

• Unaflex

• Unisource Mfg.

• Victaulic Co. of America

• Watts Radiant

• Watts Regulator Company

• Waukesha Foundry Co., Inc.

• Wirsbo Co.

• Woodard Custom Painting, Inc.

• Yarway Corp.