The Rotary Airlock HR 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 3 different sizes (HR-37, HR-67, and HR-119) and 5 standard types of construction all of which are equipped with outboard bearings and seals.