https://www.ebay.com/sch/i.html?_nkw=Allegro+Yellow+Manhole+Ventilation+Pass+Thru&_sacat=0&_dmd=2

Allegro Yellow Manhole Ventilation Pass Thru

Regular price
$207.00
Sale price
$141.00

Manhole Ventilation Pass Thru, Construction Vinyl/Polyester, Outlet Size 8 In, For Use With Blowers And Ducting In Manhole Applications, Width 20 In, Length 32 In. (duct stored), 62 In. (duct in use), Color Yellow, Includes Air Vent, 90 Degree Elbow, And Built-In Mounting, Storage Bag