I expected this cap to be exactly 5" inside diameter to fit snugly in the metal outlet I have there. that's 5". Unfortunately there is about 1/8" of free space left in this vent on all sides. While it "slips" easily onto my exhaust pipe, it doesn't fit snugly enough to stay on. Maybe there are some Is there a metal cuff I should buy that I don't know about? At this point I just stuffed some insulating strips in the form of duct tape into the gaps to keep the vent from falling off. Not sure if it's worth returning this vent for 6, $35 or not.
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