Brass & Copper Elkhart, Merit, Mueller, NIBCO, ProPress System
Bull Plugs   Phoenix/Capitol, Mills, Penn Machine, WFI
Cam & Groove   Dixon
Cast Iron   Charlotte Foundry, AB&I, Matco Norca 
Cast Steel   Glover Machine
Couplings   Phoenix/Capitol
Drip Pan   Keckley, Kunkle
Flanges (Steel)   Boltex, Weldbend
Flanges (Stainless & Alloy)   Western Forge
Forged (Steel)   Phoenix/Capitol, Penn Machine
Forged (Stainless & Alloy)   Phoenix/Capitol, Penn Machine
Grooved   Gruvlok
Malleable   Anvil, Ward
Mechanical (Couplings & Clamps)   Nappco, Smith Blair
Nipples   Beck Mfg., Phoenix/Capitol, E. A. Gray, Merit, Penn Machine
O-Lets (Steel)   Penn Machine, Phoenix, WFI
O-Lets (Stainless & Alloy)   Custom Outlet, Penn Machine, Phoenix, WFI
PVC   Chemtrol, Spears
Sanitary   Jensen, Thomsen, Dixon/Bradford
Stainless   Merit, Penn Machine, ProPress
Swage Nipples   Phoenix/Capitol, Mills, Penn Machine, WFI
Tube   SSP
Welding (Steel)   TFA, Weldbend
Welding (Stainless & Alloy)   Felker