Barnes & Jones 3/4" Big Mouth Main Air Vent

The Barnes & Jones “Big Mouth” vent is a thermostatic main vent designed for maximum evacuation of air and non-condensable gases from low- pressure steam systems. Available in 3/4" NPT (standard) and 1/2" NPT (special order). Recommended install at 8"-10" above the steam piping and 12" from the end of the steam main. Cross-over traps installed in the horizontal position Features: Large Air Venting Capability Factory Calibrated & Tested Bronze Body, Forged Brass Cover, Union Nut & Tailpiece Piping Pattern: Vertical (Air Vent) application Specifications: 3/4" NPT