Hoffman Specialty 401422 1A Angle Steam Vent, 1/8″ NPT, 1.5 PSI

Description

Hoffman Specialty 401422 — 1A Angle Steam Vent Overview

The Hoffman Specialty 401422 is a Model 1A Angle Body Steam Vent designed for use on one-pipe steam heating systems. Featuring a 1/8″ NPT connection and rated for 1.5 PSI operating pressure, this vent is engineered to automatically release trapped air from steam radiators, allowing steam to fill the radiator quickly and efficiently for optimal heat distribution.

How It Works

As steam enters the radiator, the thermostatic element inside the vent senses the temperature rise and closes the vent, trapping steam in the radiator to deliver heat. During the off cycle, the vent reopens to purge air and non-condensable gases, readying the system for the next heating cycle. The angle-body design makes it ideal for installation on the air vent tapping of most standard cast iron radiators.

Key Features

• Model 1A angle-body configuration for standard radiator air vent tappings
• 1/8″ NPT male connection for easy installation
• 1.5 PSI pressure rating — suited for low-pressure one-pipe steam systems
• Thermostatic operation: opens to vent air, closes on steam contact
• Durable brass and thermostatic element construction
• Helps improve system efficiency and even heat distribution across all radiators
• Direct replacement for worn or failed steam vents on residential and light commercial systems

Specifications

• SKU: 401422
• Model: 1A
• Type: Angle Steam Vent (Radiator Air Vent)
• Connection Size: 1/8″ NPT
• Pressure Rating: 1.5 PSI
• Body Style: Angle
• Brand: Hoffman Specialty (Xylem)

Application

The Hoffman Specialty 401422 is the go-to choice for HVAC technicians and plumbers servicing one-pipe steam heating systems. Proper radiator venting is critical to system balance — a failed or clogged vent leads to cold radiators, water hammer, and inefficient operation. Replacing with a quality Hoffman vent restores proper system performance quickly and reliably.