What is the diameter
The coupling like all the fittings have two diameters, the entrance made smaller to slide inside 4" duct with a 3 7/8" diameter. The exit has a 4 1/8 diameter to slide over the receiving fitting or duct
$14.50
Product Information It is a venting dryer fitting that makes hooking up dryer vent in...
$12.00
Product Information Dryer vent fittings for hard metal duct for installing electric or gas clothes...
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Product Information This is a 90 degree turn non sealed dryer vent fitting elbow pipe...