- Alabama Metal Industries
- Anvil Internaitonal-ASC
- Apollo Valves/Conbraco Industries
- Aquatherm
- Bonney Forge
- Crane Valve Co
- Elkhart Products
- Flo-Tite
- CMC Steel
- Hanna Steel
- Homestead Valve
- Matco Norca
- Merit Brass
- Milliken Valve
- MIRO Industries
- Mueller Industries
- NewAge Casting
- NIBCO, Inc.
- Nucor Steel – Auburn
- Nucor Steel – Berkeley
- Nucor Steel – Darlington
- Nucor Tubular Products
- Penn Machine
- SDI-Roanoke Bar Div
- Southeastern Hose
- Sterling Pipe & Tube
- Titan Flow Control
- Tour & Anderson Valves
- Trerice Gauges & Valves
- Victaulic Co of America
- Ward Mfg
- Watson McDaniel
- Weiss Instruments
- Weldbend Corp
- Wheatland Tube Co