Hoffman Specialty 401497 Model 77 1/8″ Automatic Air Vent 50 PSI Max

Description

Hoffman Specialty 401497 — Model 77 Automatic Air Vent

The Hoffman Specialty 401497 is a Model 77 automatic air vent designed to continuously and automatically purge trapped air from hot water heating and hydronic systems. Reliable air elimination is critical to maintaining efficient heat transfer, preventing noise, and protecting pumps and piping from air-induced corrosion. This compact vent features a 1/8″ connection and is rated for a maximum working pressure of 50 PSI, making it well suited for residential and light commercial hydronic heating applications.

Key Features

• Automatic air venting — continuously releases trapped air without manual intervention
• 1/8″ connection for easy installation in standard hydronic piping
• 50 PSI maximum working pressure rating
• Compact, low-profile design ideal for tight installation spaces
• Durable construction built to withstand the demands of hot water heating systems
• Trusted Hoffman Specialty engineering for long-lasting, dependable performance

Specifications

• SKU: 401497
• Model: 77
• Connection Size: 1/8″
• Maximum Working Pressure: 50 PSI
• Type: Automatic Air Vent
• Brand: Hoffman Specialty (Xylem)

Application

The Model 77 automatic air vent is ideal for use on hydronic heating systems, boiler piping, radiators, and convectors where air pockets can reduce system efficiency. Install at high points in the piping system where air naturally accumulates for optimal performance.