23 2200 - Steam and Condensate Piping
See also: 22 1053 - Metallic Piping & Fittings
- Armstrong International
- Richards Industries - Bestobell, Jordan Valve, Marwin Valve, Hex Valve,
Steriflow Valve and Lowflow Valve
- Watts - Watts, AERCO, Ames Fire & Waterworks, Apex, BLUCHER, Dormont, FEBCO, HF scientific, Mueller Steam Specialty, Orion, POWERS, PVI Industries, SunTouch, tekmar Control Systems
- Wheatland Tube Company, a division of Zekelman Industries
- Xylem