shop-vac high performance 90304/90344 cartridge filter, fits most 5-16 gallon shop-vac wet/dry vacuums, high efficiency filtration paper, washable and reusable, 1 pack is up for auction in Tools & Home Improvement. The current bid is $1.00, 95% below the $20.99 MSRP, in New/Like New condition. This auction has ended — similar items appear in live auctions regularly.