#3418 75mm duct coupling$25.00 #3418 75mm duct coupling quantity Add to cart Description Description #3418 75 mm duct coupling, includes two hose clamps Related products Add to cart #4401: 3.5″ Warm Air Duct Insulation (per foot) $7.00 Add to cart #3425: 75mm Air Intake Grille/Scoop $125.00 Add to cart #5316 Isolation kit $18.00