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SELKIRK Corp 187704 Wall Thimble, 4-Inch:
$26.25
4\" 4RV-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.4\" 4RV-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.
