https://www.ebay.com/sch/i.html?_nkw=Allegro+9600+50+Ducting+Adaptor+Reducer+16In+To+8In+Nyln&_sacat=0&_dmd=2

Allegro 9600-50 Ducting Adaptor/Reducer, 16In. To 8In, Nyln

Regular price
$139.00
Sale price
$89.00

Ducting Adaptor/Reducer (16 to 8 In.), Construction Nylon, Outlet Size 8 In, For Use With Mfr. No. 30284, 9515, 9515-01, Color Silver, Includes Duct-to-Duct Connector