Three types of heavy-duty rotary airlocks are available from this company: Drop Thru, Blow Thru and Side Entry. All units come standard with regreasable bearings, helical gearboxes, predrilled body vents and predrilled air purge connections. These valves are rated up to 20 PSI pressure differentials and units are available for temperatures in excess of 1000°F. All units features large rotor shafts with thick beveled blades as standard. Carolina Conveying Beaverdam Industrial Park, 162 Great Oak Drive Canton, NC, 28716