The Rotary Airlock HS Series meters product out of a hopper while isolating the air pressures on either inlet or outlet of the airlock. A typical application for an airlock is to meter product into a convey line. Our standard rotary airlock/feeder offers 8 different sizes from HS-77 to the HS-2218 and 6 standard types of construction all of which are quipped with outboard bearings and seals.