ONE O2 sensor weld bung made of 304 Stainless – along with ONE coated steel bung plug
The thread pitch is 18mm x 1.5 which is typical O2 sensor threads which means it will fit 99% of the O2 (oxygen) sensors in the market place.
These are high quality FAB-PROS weld bungs with the round tube curve notched (also called “coped”) into the bottom so it lays nicely into your round tube for precise fit during welding.