1.[Perfect Compatibility] The cartridge filters are compatible with Craftsman 17816, 9-17816, 9-17784, 9-17761, 9-17066, 9-17741, 9-17742, 9-17765 and 9-17762 Wet Dry Vacuum Cleaner, Fit most of the 5 gallon and larger vacs made 1988 and after. Please be noted that: This is not an OEM product. Any use of the brand name or model name is intended solely to demonstrate compatibility of this product. 2.[Great Value Package] This package will come with 3 pieces of premium 9-17816 cartridge filters. It is a cost-effective choice to supplement the replacement HEPA filters for your craftsman wet dry vacuum. It is recommended to replace the filter every 2-3 months to ensure a y air environment for your family or pets. 3.[]Our upgraded 9-17816 filter is made of high-quality HEPA materials, adopts advanced low energy consumption and low density structure technology, and has lower wind resistance, thus ensuring the highest filtration efficiency and the lowest energy consumption, while extending the life of the vacuum. All the materials used for the filters are environmentally friendly and will not have any pollution to the environment. And they are also with excellent workmanship. 4.[Excellent Performance]The multi-layer and ultra thick HEPA materials deliver upgraded and stronger capabilities to filter up to 99% of dust, debris, smelly smoke, pet smells, impurities, suspended harmful particles in the air. Just choose our high quality, durable and high-efficiency 9-17816 filters to provide you a y and comfortable air environment.