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Bard part number 8620-176 is an OEM 3 inch stainless steel drain tee used with the Bard VVK-5 optional vertical venting kit on compatible Bard wall mount gas heat units, where it helps manage condensate drainage from the vent system so moisture is routed to the drain tubing instead of collecting in the venting. If you are servicing a unit that is vented vertically through a roof or overhang, replacing a corroded or leaking drain tee with the correct factory part helps maintain proper vent drainage and reduces the risk of water-related issues in the burner compartment. Verify your unit model and the VVK-5 kit configuration before ordering to ensure correct fit and connection size.