Premium 304 Stainless Steel O₂ Sensor Bung (M18×1.5) – Lipped + Built-In Heat Sink, Weld-On

Upgrade your exhaust system with unmatched precision and endurance.

Crafted from 304-grade stainless steel, this weld-on O₂ sensor bung delivers superior corrosion resistance and strength, standing up to the high heat of performance exhaust systems with ease. Its integrated heat sink design—featuring a lipped, finned profile—distinguishes it from standard bungs, offering improved thermal dissipation and enhanced sensor accuracy. The machined M18 × 1.5 threaded interface ensures a perfect fit for mainstream wideband sensors and OEM replacements alike.

Key Specs:

• Material: High-quality 304 stainless steel

• Thread: M18 × 1.5 (universal fit for most O2 sensors)

• Dimensions: 25 mm diameter × 20 mm length (compact, precision-engineered)

• Feature: Lipped, finned heat sink—built-in for optimal performance

Why choose this bung?

1. Superior durability – Withstands extreme temperatures and resists oxidisation.

2. Optimised sensor performance – The finned heat sink ensures more accurate readings and prolonged sensor life.

3. Effortless installation – Smooth weld-on application makes it ideal for custom fabrication or repairs.

4. Perfect fit – Precision machining guarantees tight, leak-free sealing.

Whether you're tuning a competition vehicle or building a custom performance exhaust, this bung is the high-precision, high-performance choice. Trust Bend Brothers—Queensland’s next-day shipping specialists—to deliver fabrication parts that perform as hard as you do.