Product Description3"", 3RV-WT, Wall Thimble. Adjusts 4-1/8"" to 7"" to fit wall thickness. Round Type B gas vent. When installed according to manufacturer specifications, the wall thimble provides the required 1 inch air space to combustibles. Tested and listed per UL-441 for installation as type ""B"" and B-W gas vents to be installed in single and multi-story buildings.From the Manufacturer3"", 3RV-WT, Wall Thimble. Adjusts 4-1/8"" to 7"" to fit wall thickness. Round Type B gas vent. When installed according to manufacturer specifications, the wall thimble provides the required 1 inch air space to combustibles. Tested and listed per UL-441 for installation as type ""B"" and B-W gas vents to be installed in single and multi-story buildings.
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