HFR Fabrication 304SS O2 Bung Cap – Secure. Serviceable. Race-Proven.

Seal your O2 bungs with confidence using the HFR Fabrication 304 Stainless Steel O2 Bung Cap, designed for durability, reliability, and ease of use. Whether you're blocking off unused bungs during tuning or sealing a secondary sensor port, this cap is built to perform under pressure.

🛠️ Machined from Solid 304 Stainless Steel – Corrosion-resistant and heat-tolerant for long-term durability in high-temp exhaust environments.
🔧 3/8" Allen Head Design – Easy to install and remove with a standard Allen wrench—even in tight spaces.
🧱 Perfect Thread Engagement – Precision-cut threads ensure a tight, leak-free seal every time.
🔥 Ideal for Turbo, Race, and Street Applications – Whether you're running widebands or capping test ports, this plug keeps your system clean and secure.
🇺🇸 Proudly Made by HFR Fabrication – Trusted by professional builders, tuners, and race teams across the country.

Pair it with any standard M18 x 1.5 O2 bung for a clean, finished look and bulletproof performance.