The VF3500 3-layer pleated paper replacement filter is designed for RIDGID wet/dry vacuum (3 - 4.5 Gallon) to capture fine dust and trap particles such as, fine powders and cool fireplace ash. The filter can be washed and, if dried properly, reused. Changing shop vac filters often is strongly recommended to increase the vac's performance and to help extend vacuum life as it protects the motor from harmful dust and debris. This product should only be used for dry pickup. This filter will fit your vacuum if your filter cage height is 4.5-5.5 inches. These filters are sure to help keep your homes air clean AND help improve your vacuuming. Filter can be lightly washed for reuse, allow filter to dry before using again.