Zinc-plated steel.
Fits 18mm x 1.50 sensor plugs.
Required with HD 86 and up models equipped with non-O2 (oxygen) sensor that have an exhaust system installed with stock threaded sensor bung holes.
Can also be used on HD models when O2 sensors are no longer needed.
Fits:> 86-06 HD models (with exhaust system equipped with O2 sensor bungs)
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