1/8" Hy-Vent Air Vent for Water Heating Systems

The Taco 400-4 Air Vent provides automatic air elimination for hydronic heating and cooling systems, ensuring quiet, efficient operation and extended equipment life.

Designed for use in closed-loop water heating and cooling systems, the Taco 400-4 Automatic Air Vent removes trapped air to maintain optimal system performance. Its reliable brass construction and float-type design deliver long-lasting dependability with minimal maintenance.

• Model number 400-4 identifies this Taco Automatic Air Vent engineered for efficient air removal in hydronic water heating systems.
• Automatically releases air pockets that can reduce system efficiency, cause noise, or contribute to corrosion.
• Constructed from durable brass for corrosion resistance, strength, and compatibility with standard heating system materials.
• Compact design allows for installation in confined spaces such as boiler headers, air separators, and distribution manifolds.

Technical Data & Specifications

• Manufacturer: Taco Comfort Solutions
• Model Number: 400-4
• Product Type: Automatic Air Vent
• Application: Hydronic heating and cooling systems (closed-loop water systems)
• Connection Size: 1/8 inch NPT Male
• Body Material: Brass
• Float Material: High-strength corrosion-resistant polymer
• Maximum Operating Pressure: 150 psi (10 bar)
• Maximum Operating Temperature: 240°F (115°C)
• Operation Type: Float-operated automatic air release
• Installation Orientation: Vertical, top-mounted on system piping or components
• Maintenance: Low-maintenance design with easily replaceable cap assembly
• Seal Type: Viton O-ring for reliable sealing and long service life
• Finish: Natural brass
• Compliance: Meets applicable ASME and hydronic component standards
• Manufacturer Warranty: Limited warranty against material and manufacturing defects