- Aaliant
- ABZ Valve
- Acorn Engineering Company
- Actaris
- Alloy Stainless Products
- American Standard
- American Valve
- Ames Co (Watts Division)
- Ametek
- Amri Inc
- Amtrol Inc
- Anaco
- Anvil International Inc
- Apollo Valves
- Arcelor Mittal P&T Canada
- Argo Industries
- ASCO
- Automatic Timing & Controls
- A Y Mcdonald Mfg. Co.
- B-Line
- Babbitt Steam Specialty
- Backman Foundry Machine
- Baker Coupling Co.
- Band It Idex, Inc
- Baum
- Bemis Mfg
- Benko Products Inc.
- Bergen Power
- Bettis
- Billco Corporation
- Bonney Forge
- Bradley Corporation
- Brasscraft
- Brenelle Company
- Bristol Metals
- Bull Moose Tube Co.
- Burnham
- C&B Piping Inc.
- Caleffi North America
- Carpenter & Paterson
- Centoco
- Century Instrument Co.
- Cerro Tube
- Cerus
- Check All Valve Mfg. Co.
- Chemtrol
- Chicago-Faucet
- Chronomite
- Circor Energy Products
- Clayton Corporation
- Clow Valve Co.
- Collins
- Colmac Coil
- Conley Corporation
- Core Pipe
- Crane Energy Flow Solutions
- Crane Plumbing
- Cresline Plastic Pipe Co
- CSI Designs
- Danfoss
- Delta
- Demco
- DFT, Inc.
- Diamond Gear Co.
- Dixon Valve
- Dresser Piping Specialties
- Dwyer
- Eaton Strainer
- Ebinger Manufacturing Co.
- Edward Valves
- Eemax
- Elite Valve
- Elkay
- Elkhart
- Emco
- Erico International Corp.
- Essex Brass Corporation
- Faure Herman
- Febco
- Felker Piping Products
- Fire Protection Products, Inc.
- Flexcon Industries
- Flexitallic
- Flow Line Valve & Controls
- Flowrox
- Flow Seal
- FMC Technologies
- Franklin Valve and Supply
- Freelin-Wade Co.
- Gates Corporation
- GE Measurement & Control Solutions
- General Plug & Manufacturing
- George Fischer, Inc.
- Gerber
- Global Flow Technologies
- Globe Pipe Hanger Products, Inc.
- Goss Gas, Inc.
- GPI
- Guardian
- H.O. Trerice
- Halsey Taylor
- Ham-let
- Hamilton Tanks
- Harvel Plastics, Inc.
- Haws
- Hayward Industrial Products
- HBD Thermoid Industries, Inc.
- Heat Controller, Inc.
- Heatmaker
- Hi-Tech Duravent
- Highland Tank
- Hilti, Inc.
- Hitech Technologies
- Hoffman
- Hoke, Inc.
- Holyoke Fittings, Inc.
- Homestead Valve
- Hyspan Precision Products, Inc.
- Ideal Fittings
- IFM Efector
- Industrial Fiberglass Specialties
- InSinkErator
- Intersan
- Ipex USA LLS
- IPSCO
- ITW Buildex
- ITW Red Head
- J & J Metal Products
- JFlow Controls
- John Deere Green Tech
- Jomar International
- Jones Stephens Corporation
- JR Smith
- Just Manufacturing Co.
- Keckley
- Kerkau
- Kitz
- Koppel
- Kuriyama of America, Inc.
- Lasco Fittings, Inc.
- Legend Valve & Fitting
- Lenox
- Leonard Water Temperature Controls
- Liquid Controls Sponsler
- Lochinvar
- Maass Flange Corporation
- MacDonald-Miller Facility Solutions
- Macomb Group
- Mansfield Plumbing
- Marco Products
- Marsh Bellofram
- Masco Bath
- Mass Tracker
- Maxitrol
- Michigan Steam Equipment, Inc.
- Micro Motion
- Midland Metal Mfg.
- Milliken Valve Company
- Milwaukee Valve Co.
- Mission Rubber Company
- Mjk N.A. Flowmeters
- Modine
- Moen Inc.
- Mueller Company
- Mueller Steam
- Mueller Systems
- Napac Incorporated
- National Pipe Hanger
- NewCon Co.
- Newco Valves
- Niagara Meters
- NIBCO INC.
- Nicholson Unions
- Noble Company
- Nordstrom Valve
- Northwest Pipe
- Novaflex Hose, Inc.
- Nrp Jones
- Oasis Coolers
- Oatey Scs
- Olson Technologies, Inc.
- Opw (Civacon Grounding Systems)
- Opw Engineered Systems
- Orion Enterprises, Inc.
- Pacific Echo Inc
- Parker
- Patterson Pumps
- Pennsylvania Machine Works
- Phd Manufacturing Inc.
- Phoenix Forging Co.
- Pick Heaters
- Pipeconx
- Pipeline Valve Specialty Inc. (T3)
- Plastic Trends
- Porter Cable
- Potter Roemer
- Powers Control
- Proco Products
- Pt Coupling Company
- Quality Pipe Products
- Racine Federated
- Rath Gibson
- Resun Valve
- Ridgid
- Rilco
- Robert Manufacturing Co.
- Robertshaw
- Robvon Backing Ring
- Rubber Fab
- Saferack
- Sales Service Plus
- Sensor-Tech Inc.
- Sierra Monitor
- Sigma Corporation
- Simpson Dura-Vent
- Sioux Chief Mfg Co Inc
- Slant Fin Corporation
- Sloan
- Smith Blair Inc.
- Smith Cooper International
- Speakman Company
- Spears Manufacturing
- Spence Engineering
- Spirax Sarco Inc.
- Stanley Industries
- Stevens Pump Company
- Stockham
- Straub Manufacturing
- Sun Flow, Inc
- Sure Flow
- Symmons Industries, Inc.
- Syracuse Stamping Co
- Systecore
- System Sensor
- T&S Brass And Bronze
- Taylor Forge Stainless
- Tba Inc
- Texcel Rubber
- The M.K. Morse Company
- The Wm Powell Co
- Thompson Plastics
- Tolco
- Topline Process Equipment Co
- Toptech Systems
- Trinity Fitting & Flange
- Tube Forgings Of America
- Turbo Torch
- Tyler Pipe Company
- U.S. Pipe & Foundry Co.
- United Brass Works Inc
- US Hose Corporation
- Value Engineered Products
- Valve Related Controls
- Velan
- Victaulic
- Viega
- W.A. Whitney
- Ward Mfg.
- Waste King
- Watson Mcdaniel
- Watts Brass And Tubular
- Watts Watertech
- Weldbend
- Welding Outlets Inc.
- Westlock Controls
- WFI International
- Wheatland
- Wheeler Rex Mfg Co
- Whitney Company
- Willoughby
- Wilo Pumps
- Wolverine Tube Inc.
- Woodford Manufacturing
- Yarway
- Zoeller
- Zurn Industries
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