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Bard part 8620-174 is a 3 inch stainless steel rain cap made from AL 29-4C stainless, designed for Bard vertical venting applications such as the VVK-5 vertical venting kit. This OEM vent termination component helps keep rain and wind driven moisture from entering the vent system while maintaining proper flue discharge, which is especially important for reliable operation and to reduce corrosion risk in harsh outdoor environments. Use it when replacing a damaged or missing cap, and verify the vent kit and vent size on your unit documentation to ensure correct fit and safe venting performance.