BTO2-Plug Universal Stainless Steel O2 Bung Plug Fitting M18x1.5-17mm Head

Not much to say other than it works as described and fits a standard narrowband and wideband O2 sensor bung. I removed one sensor, so i used this to cap the O2 bung.

I welded a bung fitting in my exhaust system to hold an O2 sensor for setting up fuel mixtures. Once the setup was complete, the O2 sensor was no longer necessary. So, I plugged the hole with this plug. Worked perfectly.

I ordered this to plug a hole left after removing a wideband O2 sensor from my car. It threaded right in, sealed fine, and was relatively cheap, so I'm pretty happy.

I bought these to go with a Patriot Defender 2 into 1 pipe for a Harley Softail. They fit perfectly, seem to be well made, and I really like the fact that they are stainless.

Ordered these to plug my collectors when the sensors are out. What I received is LAUGHABLE! 1) not exactly sure what size theses are suppose to be? One seems to be 19mm the other seems to be 3/4” neither fits either size what I’d describe as correctly. 2) They’re obviously from two different manufactures. Neither is of any kind of quality. 3) The one with more threads and the thinner head has the threads beat up badly. 4) the one with fewer threads (as I count 2.5 usable threads) is ridiculous 5) the flank of the threads is differ from on to the other. I could keep going on, but why bother. You get the idea.... junk! Why waste my time being ignored by this seller? Consider it my lesson learned and fair warning to you.

really didn't need this expensive plug, the ones on the original worked just fine.

Nice high quality piece,big hex head can be easier to remove later depending on application & the amount of room surrounding it.Plug is helpful to block off the unused O2 port when using a wideband O2 gauge on a V8 and you want the option to move the sensor back and forth between banks.

Perfect fit to block off hole from O2 sensor removal