Check the listing for details. TRAILER / RV VENTS, BLACK, 1 inner, 1 outer, Utility, Livestock, Motorcycle. Condition: New. Listed at 8.59 USD. TRAILER / RV / BUILDING VENTS SEE ORDERING OPTIONS ! Four options include 1 Set, 1 Set with black mounting screws, 2 Sets,2 Sets with black mounting screws. Each kit includes one round inner and one scoop outer vent cover. The water resistant design is made to keepinterior temperatures at a much lower level thereby protecting the contents. They can be used forenclosed utility or livestock trailers. along with sheds or any enclosed area. The outside scoop has a unique design that produces a Venturi effect that both magnifies it capabilities but also keeps things dryin the process. Each part also has a molded in grill to keep the critters out. Inside vent has a 4" flange and a 3" dia tube.Outside vent is 8 X 6 X 1.5 GREAT FOR:Motorcycle TrailersUtility & Tool TrailersLivestock TrailersSmall buildingsShedsRV'sand moreOur shipping is always Fast and Free!