Home / Ducting / PVC Grilles & Diffusers / Gravity Shutter Wall Outlet Gravity Shutter Wall Outlet £1.20 DUCTMASTER PVC Ø100mm wall outlet with gravity flaps. Gravity Shutter Wall Outlet quantity Add to basket SKU: PVC100WH Categories: Ducting, PVC Grilles & Diffusers Tag: PVC Grilles & Diffusers Product ID: 10454