DuraVent 4GVWT Wall Thimble ~ 4 inch

This galvanized Type B wall thimble is needed when Dura-Vent Type B Gas Vent passes through the house. A length of Type B Gas Vent is needed to pass through the thimble and connect to a tee for your vertical run. 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 3.5in – 6in. Diameter 4 inches.