Designed to help control the exhausting airflow from a vac.Diffuses wet dry vacuum airstream to reduce blowing debris and dust. Reduces the effects of the exhaust on uncollected dirt and debris. Minimizes wet dry vacuum noise without effecting suction power. Help reduce air noise with this vac muffler diffuser.Fits most vacs with a standard 2-1/2 inch exhaust port. Locking tab securely holds wet dry vacuum muffler diffuser in place. A 2.5-inch diameter allows for larger sized debris collection and maximum airflow.