Natural gas supply piping transitions to equipment through an isolation valve followed by a three-inch minimum dirt leg and a typical pipe union if not flanged. A flexible appliance connector is installed where required for field connection to the gas equipment.
FLEX/APPLIANCE CONNECTOR WHERE REQUIRED FOR FIELD INSTALLATION DIRT LEG, 3" MIN UNION TYP. (IF NOT FLANGED) ISOLATION VALVE NG NG TO EQUIPMENT
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