Vintage Perko ventilator. This item has been replaced by 0870DPOCHR. The newest version has a plastic base with a chrome plated cover. This item has a metal base and cover. 5 1/8” long, 4” wide and 3” diameter hose connection. New old stock item not in original packaging. There are very minor blemishes to the chrome from years of storage. There is no mounting hardware included.