The saying, "out of sight, out of mind" is quite real when it comes to filters. These little devices in our home can help protect you from allergens floating in the air. But, if not regularly cleaned and washed, it can lead to sub-optimum efficiency and worse can even shorten the lifespan of your vacuum. This listing is for a high-efficiency washable and reusable Hoover Windtunnel T-Series replacement pre-motor filter.