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Bard part number 8620-175 is a 3 inch stainless steel fire stop used with Bard vertical vent applications such as the VVK-5 vent kit, helping maintain the required fire barrier at a wall or floor penetration where vent piping passes through. In the field, this piece is typically replaced when a vent kit is being installed, reworked, or inspected for code compliance, and using the correct Bard OEM fire stop helps keep the vent penetration properly protected and matched to the intended Bard venting system. Verify the vent kit and pipe size for your specific Bard unit before ordering to ensure proper fit and the correct penetration detail.