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Holley Oxygen Sensor O2 Bung Weld-In Style

Oxygen Sensor O2 bung weld in style used for any Application that utilizes an Oxygen Sensor

PART# 534-49

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O2 Weld Ring for any Application That Uses an Oxygen Sensor


  • Genuine Holley Quality Parts


BrandHolley EFI
Emission Code5
Material12L14 cold roll steel
Product TypeOxygen Sensor O2 bung
Thread Size18mm x1.5
Type of ComponentOxygen Sensor Bung
Part Number534-49



This part is legal for sale or use on Emissions Controlled Vehicles, Uncontrolled (Non-Emissions Controlled) Vehicles, and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations.

Tech Resources

Requires welding and a 7/8" hole to be drilled into the exhaust. Oxygen sensors need to mounted with the tip pointed on a downward angle. A minimum of 10 degrees from horizontal and 15 degrees from perpendicular is recommended.
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