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Bard part number 9011-023 is an OEM oil nozzle used on Bard HVAC equipment that relies on oil-fired heat, delivering a 0.75 GPH flow rate with a 60 degree solid spray pattern to help the burner atomize fuel correctly for stable ignition and efficient combustion. Replacing a worn or partially plugged nozzle can resolve common oil heat issues like hard starts, smoky operation, rumbling, or poor flame quality, but correct sizing matters, so match the GPH and spray angle to your unit documentation and follow proper burner setup practices after installation to maintain Bard specified performance.