Ram4Sam said:TD, is this what you are after...
http://southsidecontrol.com/acatalog/Products_A31482____Access_Valve_Half_Union_1_8_6347.html
It is a common commercial refrigeration fitting. Look locally for names like United Refrigeration, American Refrigeration Supply, Refrigeration Supply Distributors.
Sam
Sam I used to save those off the r-12 compressors,but we don't see r-12 anymore

Bob