M12 Weld-in Stainless Steel O2 Oxygen Sensor Port & M12 x 1.25mm Stainless Steel Plug. Sensor port is 10mm in total height. Collar is 3.5mmTotal height of port with bolt is 15.2mm. This sale is for 1 Stainless Steel Weld-in M12x1.25mm Threaded port.
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