A. Y. McDonald Mfg. Co.
AAF
AAF International
ABS
Acorn Engineering  
Acudor Products Inc.
Advance Tabco
Aeroquip Corperation
Alco Controls
Alsons Corperation
Amerec Products
American Granby Co.
American Metal Products
American Standard
American Valve
Ametek
Amtrol
Anderson-Greenwood Crosby
Aqua Glass
Armstrong International
Armstrong Pumps
Asahi-America
Ashcroft
Automatic Switch
Badger Meter
Barnes & Jones Inc.
Bell & Gossett
Bemis Mfg. Co.
Berkeley Pumps
Blue-White Industries
Bobrick Washroom Equipment
Bradford White
Bradley Corporation
Bramec Corp.
Brasscraft
Bucket Boss
Buderus
Campbell Manufacturing
Canfield Technologies
Capitol Manufacturering Company
Carnes Manufacturing
Carrier
Cerro Copper
Channellock
Charlotte Pipe and Foundry Company
Chem-Tainer Industries
Chicago Faucet
Circle Seal Controls Inc.
Clamp-All Corp.
Conbraco Industries
Crane Valve Group
Cuno, Incorporated
Daikin AC
Delta Faucet
Dodson Steel Products
Dormont Manufacturing
Dresser Industries
Duff-Norton
Dwyer Instruments
Eemax Inc.
Eljer Plumbingware
Elkay
Elmdor/Stoneman
Empire Comfort Systems
Energy Saving Products
Eugene Ernst Products
Fernco, Inc.
Field Controls
Flexaust Co. Inc.
Flex-Hose Co.
Flomatic
Flowline Level Controls
Fluidmaster
General Pipe Cleaners
General Wire Spring Company
George Fischer
Goulds Pumps
Great Lake Instruments
Grid Industrial Heating
Grohe
Grundfos Pump Company
Halsey Taylor
Hammond Valve
Hansgrohe Inc.
Harvel Plastics Inc.
Haws Company
Hayward Industrial
Hedland
Heat Transfer Products
Hercules Chemicals

Hi-Velocity
Hoffmann
Honeywell International
Hot Box
Hubbell Electric Heater Co.
IMCOA
IMI Cash Acme
Inline Industries
In-Sink-Erator
IPS Corporation
ITT A-C Pump
ITT Engineered Valves
ITT Jabsco
Jacuzzi Inc.
Jay R. Smith
Jefferson Union
Johnson Controls
Jomar
Knaak Mfg. Co.
Knauf Fiberglass
LA-CO Industries
Ladish Co.
Laing Thermotech
Landis & Gyr
Lasco Fluid Distribution Products
Lawler Manufacturing
Leonard Valve
Liberty Pumps, Inc.
Little Giant Pump Company
Maxitrol
McDonnell & Miller
McGill AirFlow Corp
Merit Brass Company
Mestek, Inc.
Mill-Rose Company
Milwaukee Electric Tool Corp.
Mission Rubber Co.
Moen Faucet
Mueller Steam Specialty
Myson Water Heaters
Nesbitt
Nibco Inc.
NuTone
Oatey
Orion Fittings Inc.
Parker Hannifin Corp.
Peerless Heater Company
PEF Industries
Porcher
PowerTwist Plus
P-T Coupling Company
Reading Tube
Rectorseal 
Red-White Valve Corp.
Ridgid Tool Company
Robert Mfg. Co.
Sioux Chief Mfg. Co.
Sloan Flushmate
Sloan Valve Company 
Spirax Sarco
Spirotherm
Sta-Rite Industries, Inc.
Stockham Valve Company
Sunstar Heaters
SureFire
Swan
Symmons Industries
T & S Brass
Taco Pump
Titeflex Corporation
Truebro Inc.
Tunstall Associates
Tylok Fittings & Valves
Vaughn Manufacturing
Victaulic Company of America 
Ward Manufacturing
Waterfurnace International
WaterSoft
Watts Industries
Watts Radiant
WCM Industries
Weil-McLain
Wheatland Tube Company
Williams Valves
Yarway
York
Zoeller Pump
Zonex Systems
Zurn Plumbing Products