Hydrofarm Duct Coupler 4in
$3.16 $3.95
Made of galvanized steel. Crimped on both ends for easy installation, these couplers provide the perfect solution when you need to join two runs of ducting to make a single, longer run. Use duct clamps (we recommend our Active Air stainless steel clamps, such as item code ACC4) or zip ties to secure the ducting to the coupler.