Here is a desiccant air dryer for your air compressor. This is a Wilkerson model X03-02-000. This is in good condition and was in operation up until recently. The screen on the head is in good shape. The paint is a little faded on the head of the unit and the paint on the retaining ring is chipped. I believe that the inlet and outlet are 1/4" NPT.  Feel free to email me with questions or for additional pictures.