View cart “#4414: 60/75 mm Warm Air Duct Adapter” has been added to your cart. #4401: 3.5″ Warm Air Duct Insulation (per foot)$7.00 #4401: 3.5" Warm Air Duct Insulation (per foot) quantity Add to cart Description Description Fits over #3410 ducting for additional insulation. Sold in up to 6′ pieces. Related products Add to cart #367200: Diesel Tank Adapter with filter $69.00 Add to cart #3425: 75mm Air Intake Grille/Scoop $125.00 Add to cart #3410: 3″ Warm Air Duct (25′) $250.00