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The Stainless Works 3-1/2" to 3-1/2" collector adapter with O2 bung is a TIG-welded 304 stainless steel flange adapter that includes a welded oxygen-sensor bung near the flange edge. Designed for same-diameter collector connections, it offers corrosion resistance and a dedicated O2 sensor port for tuning or monitoring. This USA-made adapter is backed by a limited lifetime warranty on materials and workmanship.
Stainless Works Collector Adapter 3-Bolt 3-1/2in OD Tubing 3-1/2in OD Outlet + O2 Bung
