National Ventilation Wall Outlet 4 Gravity Flaps-Round Spigot 125mm White

National Ventilation 5900 Round Wall Outlet with Gravity Flaps is made of plastic material and comes with 4 gravity flaps and round spigot of 125mm. Uses in both domestic and industrial ducting applications. · · · Uses in both domestic and industrial ducting applications · · Easy to install and maintain · · Comes with round spigot and 4 flaps for better performance