Roof top dryer vent / exhaust vent for use with clothes dryer, bathroom fan, stove and kitchen exhaust and more. Available for up to 12" diameter pipe. Can be ordered with a one way damper and / or screen. Made out 16 ounce copper. * Roof Vent Cap * Made of 16 ounce copper (approximately .018" or 26 gauge) * Can be used on flat or pitched roofs * Perfect application for clothes dryer vent, stove exhaust fan, and bathroom fan vents * Available in 4", 6", 8", 10", and 12" diameter pipe sizes * Configurable with one way air damper and/or screen * Pipe connection length is 4" (standard) * Manufactured in the USA by Thunderbird Products * This item is also available in Stainless Steel Dryer Vent Note: If you are using this product to vent a dryer it should not be ordered with a screen. Order with flapper only. A screen can catch the lint from your dryer causing a fire hazard. Intake Vent Note: If you are using this product as an intake vent or to exhaust a fireplace then order with screen only. The one way air damper (flapper) only lets air out.