Earl's Performance Weld-In Oxygen Sensor Bungs

Earl's Performance Oxygen Sensor Weld Fittings are the professional-grade solution for permanently adding O2 sensor ports to custom and modified exhaust systems. Whether you're converting to EFI, integrating a wideband air/fuel ratio gauge for precision tuning, or building a performance exhaust from scratch, these weld-in bungs deliver the precision craftsmanship and durability that Earl's Performance Plumbing is known for.

Key Features:

• Precision-machined weld-in bung design for a permanent, leak-free installation in exhaust tubing, headers, and downpipes
• Multiple material options available across variants — choose the material that best suits your exhaust system and application
• Recessed step design simplifies installation — drill a hole, drop in the bung, and weld in place for a clean, professional finish
• Standard 18mm x 1.5 thread compatible with most OEM and aftermarket oxygen sensors, including wideband AFR sensors
• Correct sensor orientation requires mounting with the sensor tip angled downward — a minimum of 10 degrees from horizontal and 15 degrees from perpendicular is recommended for reliable sensor function
• Broad legal compliance — legal for use on emissions-controlled vehicles, non-emissions vehicles, and racing applications
• Backed by Earl's Performance Plumbing, the brand that brought aviation-grade fluid transfer technology to the automotive performance market

Earl's Performance Plumbing has been a cornerstone of the high-performance industry for over five decades, offering the most extensive line of plumbing products available for motorsport and street applications. These O2 sensor weld fittings reflect that same commitment to quality and reliability, making them the trusted choice for fabricators, tuners, and performance enthusiasts who demand results they can count on. Select the variant that best matches your exhaust material and application for a permanent, professional O2 sensor installation.