Fits my Stanley 6 gallon wet/dry vacuum, model SL18116P. The ring is a little loose compared to the original but seems to be holding the bag well (so far). I also use this blue cloth pouch (which is included despite the bad picture showing just the ring). The blue fabric filter bag is placed on the engine and held in place by a ring. It's not a "hard" grip like the original, so you can add a tape base or something other than fillet to tighten the grip.
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