Plastic vent hood faceplate with 1 piece flapper for clothes dryer and bathroom venting. Fits 4" aluminum pipe (not included). Beveled and weighted design prevents birds from pecking the flapper open and keeps flapper closed during windy conditions. Reversible trim ring allows adjustment of the distance between the faceplate of the hood and the back open ring from .5" to 1.15". Hood can be used for various applications including vinyl siding. White.