- A & F Fitting
- Allan Aircraft Supply Co
- Allan Aircraft Supply Co
- APAC Products
- Aroplax Corp
- Bentrade Inc
- Billco Corp
- Billco Corp
- Brooks-Bradley & Kenney
- Brooks-Bradley & Kenney
- Brooks/Old City Paint
- C A Systems Inc
- Cajon Co
- Ceramic Technology Inc
- Ceramic Technology Inc
- Columbia Pipe & Supply Co
- Consolidated Pipe & Supply Co
- Custom Alloy Corp
- Custom Alloy Santa Cruz
- Diamond Aluminum Co
- Flowline Corp
- Fluidyne Corp
- Ford Meter Box Co Inc
- Formweld Fittings Inc
- G & L Fitting
- G & L Fitting
- Galperti Inc
- Galperti Inc
- General Plug & Mfg Co
- Graber Concrete Pipe Co
- Gulf Coast Nipple Co
- Gulf Coast Nipple Co
- H V Mfg Co
- Holyoke Fittings Inc
- Holyoke Fittings Inc
- Huwelco Inc
- Huwelco Inc
- Independent Pipe & Supply Co
- Industrial Supply Inc
- Jomac Sales Co
- Kennebec Supply Co
- Knickerbocker Machine Shop Inc
- Lane Enterprises Inc
- Lane Piping & Equipment Co
- Lasco Fittings Inc
- LTS Inc
- LTS Inc
- M D Stainless Svc
- Main Manufacturing Products
- Main Manufacturing Products
- Marco Supply Co
- Max Piping Products
- Mc Junkin Corp
- Mc Wane Cast Iron Pipe Co
- Mc Wane Cast Iron Pipe Co
- Nyloplast USA
- Pacific Coast Flange
- Parker-Hannifin Corp
- Piping Specialties Co
- Piping Specialties Co
- Plastinetics Inc
- Plumbing Warehouse
- Preferred Piping Systems Co
- Premier Copper & Brass Inc
- PVC Fittings
- PVC Fittings
- Robert Manufacturing
- Shaw Alloy Piping Products
- Shaw Alloy Piping Products
- Sigma Corp
- Sigma Pipefittings
- Spears Manufacturing
- Spears Manufacturing
- Standard Nipple Works
- Statco Engineering Fabricators
- Superior Supply & Steel
- Swagelok Co
- Ta Chen Int'l Corp
- Texas Pipe Works Inc
- Thomas Pipe & Supply Co
- Total Fitting & Valve
- Tube Craft Of America Inc
- Universal Imports
- Victaulic Co Of America
- Victaulic Co Of America
- Victaulic Co Of America
- Wayman Fire Protection Inc
