Top Line Manufacturing CGSTO25 Stainless Steel Oxygen Sensor Bung Weld-In Fitting

The Top Line Manufacturing CGSTO25 is a stainless steel weld-in oxygen sensor bung designed for use in custom exhaust fabrication and O2 sensor installation. Featuring the industry-standard M18 x 1.5 thread, this bung accepts all common upstream and downstream oxygen sensors, including wideband and narrowband styles.

Constructed from durable 304 stainless steel, this bung withstands extreme exhaust temperatures and resists corrosion, making it suitable for high-performance street and track applications. The precisely machined threads ensure a leak-free seal when welded into headers, downpipes, exhaust pipes, or collectors.

Key Features:

• Material: 304 stainless steel for superior heat and corrosion resistance
• Thread: M18 x 1.5 — industry-standard oxygen sensor thread
• Weld-in design for permanent, leak-free installation
• Compatible with all standard narrowband and wideband O2 sensors
• Ideal for exhaust fabrication, header building, and sensor relocation
• Includes threaded plug to protect threads during welding

Whether building a custom exhaust system from scratch or adding an additional O2 sensor bung to an existing pipe, the CGSTO25 delivers professional-grade quality at a competitive price point.