The Duct Adaptor lets you to quickly and securely attach your vac hose to an air duct. It easily attaches to the vacuum hose using a hose clamp or tape. The assembly can then be snapped into place (no screws, tape or clamps) in the air duct opening using the attachment ears built into it. This device not only makes attachment a breeze, it also significantly increases airflow because its low profile in the air duct offers so little obstruction to airflow from the duct into the hose. This allows your vacuum system to work more efficiently all through the cleaning. The access ports in the body of the adapter allow you to insert agitation tools while connected. Available in 8 inch, 10 inch and 12 inch sizes.