Taco 400-4 1/8-Inch-NPT Float Air Hy-Vent – High-Capacity Boiler Vent

Overview

The Taco 400-4 1/8-Inch-NPT Float Air Hy-Vent is a high-capacity vent designed to remove trapped air from hydronic heating networks. Built for busy hot water environments, it combines durable materials with straightforward maintenance to help your system run smoothly.

Position this vent where air tends to collect, either on the boiler itself or at elevated points along the loop. It supports multiple threaded connections for flexible installation, including 1/8 in, 1/4 in, 1/2 in, and 3/4 in fittings, making it suitable for a range of boiler sizes and configurations. With operating pressures rated up to 150 psi, it is designed for larger, more demanding setups.

Key benefits and design features

• Sturdy brass construction with a nickel-plated exterior for durability
• Designed for hot water radiators, baseboards, convectors, radiant panels, and small unit heaters, with a maximum working pressure of up to 150 psi
• Top threaded access allows opening and cleaning without disassembly

Practical usage and maintenance

This high-capacity vent helps address air pockets that can impede circulation and efficiency. Install it at the boiler or at strategic high points to vent air as the system fills and cycles.

• Multiple neck sizes provide flexible mounting and compatibility
• Nickel-plated brass offers corrosion resistance in demanding heating environments
• Easy top access supports straightforward cleaning and inspection

While performance depends on the full system design, this Taco HY-Vent offers a practical option for larger installations that require reliable venting at elevated pressures. It is well suited for retrofits as well as new installations where high-volume venting may be beneficial.