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Finally, a way to convert those costly 1/2"-20 nozzles to 1/8" pipe thread!
These adaptors come with o-rings to seal against the manifold. They move the air bleed to the outside of the manifold.
If you install the 2 piece nozzles that I sell, you can then make subsequent nozzle changes for FAR LESS $$$$!
These will work in a 1/2"-20 oil pan or trans to install a temp gauge too!