Description
Weil McLain 635-100-003 Automatic Air Vent #400 Overview
The Weil McLain 635-100-003 is the trusted #400 Series Automatic Air Vent, engineered to continuously and automatically purge trapped air from hydronic heating systems. By eliminating air pockets that cause noise, reduced efficiency, and uneven heat distribution, this vent keeps your system operating at peak performance with minimal maintenance.
Key Features
- Automatic air venting — continuously removes entrained air without manual intervention
- 1/2″ NPT connection for straightforward installation on standard hydronic piping
- Rated to 150 PSI maximum working pressure for compatibility with a wide range of hydronic systems
- Rated to 240°F maximum operating temperature, suitable for high-temperature hot water heating applications
- Compact, durable construction built to Weil McLain’s exacting quality standards
- Designed for use on boilers, distribution mains, and terminal units in residential and light commercial hydronic systems
Specifications
- SKU: 635-100-003
- Series: #400 Automatic Air Vent
- Connection Size: 1/2″ NPT
- Maximum Working Pressure: 150 PSI
- Maximum Operating Temperature: 240°F
- Brand: Weil McLain
Why Choose the Weil McLain #400 Automatic Air Vent?
Weil McLain has been a cornerstone of the hydronic heating industry for over a century. The #400 Automatic Air Vent reflects that heritage — delivering dependable, set-and-forget air elimination that protects your system’s efficiency and longevity. Whether you’re servicing an existing boiler installation or commissioning a new hydronic loop, the 635-100-003 is the professional-grade solution trusted by contractors nationwide.
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