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The HART & COOLEY 4EWT wall thimble is 4 inches, made of steel, and galvanized. It adjusts for various wall thicknesses from 4 to 6 inches. This thimble provides proper clearance for vent from combustibles and serves as a firestop.
The HART & COOLEY 4EWT wall thimble is a 4-inch galvanized steel thimble that adjusts to fit wall thicknesses of 4-6 inches.
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