Y Duct Connector 4in x 4in x 4in
https://www.dlw.co/shop/404444-y-duct-connector-4in-x-4in-x-4in-12832
https://www.dlw.co/web/image/product.template/12832/image_1920?unique=d9f876c
Made of galvanized steel. Perfect fit. Sealed seams to prevent air leaks.
