Product Description Reviews Sold in a package of 500, this is the replacement prefilter for the Quatro SPU dust collectors. Show More Custom Field __uomdescrip Each Overall Rating 0.0 0 Reviews Write a Review Create a Review Repl. Prefilters for SPU/SPU Jr (Pkg. of 500) Overall Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Add a Headline * Add a Review *