The Aar-O-Vent™ high-performance air
and dirt separator from Thrush Company Inc. provides corrosion
protection and increased performance in hydronic piping systems. It’s
available in sizes from 1.5 inches to 24 inches and larger, and it uses a
stainless steel coalescing filter medium to separate the air and dirt
from the water that can cause damage to pumps, seals, and valves.
Thrush Company Inc.Web Site: