Resideo by Honeywell AP402 Air Purger 1-1/2 Inch with 1/2 Inch Bottom Connection

The Resideo by Honeywell AP402 is a high-performance air purger designed to efficiently remove air from hydronic heating and cooling systems. This 1-1/2 inch air elimination device features a compact design with a 1/2 inch NPT bottom connection and 1/8 inch NPT top connection for easy integration into residential and light commercial applications.

Key Specifications:

• Main connection size: 1-1/2 inch
• Bottom connection: 1/2 inch NPT for system integration
• Top connection: 1/8 inch NPT for air vent attachment
• Maximum working pressure: 125 PSI
• Maximum operating temperature: 275°F

Performance Features:

• Efficiently separates and removes entrained air from system fluid
• Reduces noise, corrosion, and pump cavitation caused by trapped air
• Brass construction for durability and corrosion resistance
• Designed for use with automatic air vents to create complete air elimination system
• Suitable for both heating and chilled water applications

The AP402 air purger utilizes velocity reduction and directional change principles to separate air bubbles from system water, allowing them to rise and be expelled through an attached air vent. This improves system efficiency, reduces operational noise, and extends equipment life by preventing air-related issues in hydronic systems.