Advanced Distributor Products 76709300 Flue Box 321894 706 The Daikin McQuay 020648603 Bearing is The Daikin McQuay 020648603 Bearing is a high precision 1 15 16 inch ball bearing engineered for heavy duty commercial HVACR applications this drive prevents standby heat loss by closing the flue pipe when the burner is off and ensures safe venting by confirming the open position through an integrated end switch before ignition occurs utilizing genuine HVAC venting components like the 76709300 ensures seamless compatibility with existing gas fired equipment ensuring that exhaust gases are safely and efficiently routed out of the heat exchanger towards the vent pipe