3"" DuraVent Type B Wall Thimble - 3GVWT
Use for through-the-wall system to provide clearances for vent from combustibles.Use Wall Straps for support, one immediately below the tee, one above the tee, and one every four feet. The wall thimble adjusts for wall thicknesses from 3 1/2"" - 6"". See all 3"" Dura-Vent B Gas Vent Components.