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The DirectVent Pro 4" x 6-5/8" Inner Diameter Galvanized Wall Thimble is a component that is used in a typical venting installation. The DirectVent Pro wall thimble provides a complete wall-pass-through and fire stop. Use with Square Horizontal Cap only. May be required in Canada. Refer to the appliance manufacturer's installation instructions for requirements. Features: Type: Wall Thimble. Collection: DirectVent Pro. Use with Square Horizontal Cap Only. Provides a Complete Wall-Pass-Through and Firestop. UL Listed. Specifications: Overall Dimensions: 10" (L) x 10" (W) .