When a need exists to extend the reach of a shop vacuum this 13 foot wet dry vacuum hose is perfect. The 2-1/2-inch diameter provides a larger opening for debris collection and maximum airflow. This wet dry vac hose works with 1-7/8-inch and 2-1/2-inch shop vacuum accessories, and fits most shop vacuums with the standard 2-1/2-inch inlet port opening including most WORKSHOP Wet/ Dry Vacs.