Abstract: A reverse blow-back dust collector utilizes a simplified top removal support arrangement for suspending bag, cage and nozzle assemblies from a tube sheet having plain mounting openings therein. The top removal support includes a collar spot welded to the cage and disposed in force fit engagement with a top fold region of the bag which contains an expansion clamping ring assembly having spaced beads which interlock the bag in sealed relation in its corresponding tube sheet opening. The support also includes a flange which overlies and seats on the upper bead for transmitting cage loads thru the support to the top side of the tube sheet. Ease of assembly and removal affords improved installation and servicing operations.