2" flanges fittings for HVAC water systems.
"Spirovent® Air / Dirt Separator
The Spirovent® Dirt and Drain Air Eliminator / Dirt Separator uses a patented Spirotube® medium to "scrub” the air and dirt from the system fluid and creates two low velocity, low turbulence separation chambers. Simple to install with a straight in-line full flow design."
Sells new for $4528 online at supplyhouse.com
in use for 5 years; quite good condition. Price does not include shipping (probably $150-$200)