Description
The Hoffman Specialty 401440 is a No. 40 Radiator Steam Vent designed for reliable air elimination in residential and light commercial one-pipe steam heating systems. Engineered to automatically vent air from steam radiators during the heating cycle, this vent allows steam to fill the radiator quickly and efficiently — improving heat distribution and overall system performance.
How It Works
As steam enters the radiator, the No. 40 vent allows trapped air to escape freely. When steam reaches the vent, the internal thermostatic element closes automatically, preventing steam loss and maintaining system efficiency. When the system cools, the vent reopens to release air and prepare for the next heating cycle.
Key Features
- Designed for one-pipe steam radiator systems
- 1/8″ NPT connection for easy installation on standard radiator air vent tappings
- 6# (6 PSI) pressure rating suitable for low-pressure residential steam systems
- Thermostatic operation — automatically opens to vent air and closes when steam arrives
- Compact, durable construction for long service life
- Direct replacement for worn or failed radiator air vents
Specifications
- Manufacturer: Hoffman Specialty (Xylem)
- Model: No. 40
- SKU: 401440
- Connection Size: 1/8″ NPT
- Pressure Rating: 6# (6 PSI)
- Application: One-pipe steam radiator venting
Application
Ideal for use in one-pipe steam heating systems found in older residential buildings, multi-family housing, and light commercial properties. Proper radiator air venting is essential for even heat distribution, reduced system noise (banging/hammering), and improved energy efficiency.
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