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The Stainless Works hex‑head O2 bung plug seals unused O2 ports or wideband locations. CNC machined from 303 stainless steel, it measures 1‑1/8" OD with a 3/4" hex and M18 x 1.5 threads, and is 1" long overall. Use it to cap sensor ports during tuning or when a sensor isn't fitted; the maker recommends applying anti‑seize like Neversieze on the threads during installation.
Stainless Works O2 Bung Plug
