This tool is for charging the spheres for all SY's (Shadows) with rebuildable accumulator spheres. It is not for SZ cars with throw-away spheres.
This tool connects your nitrogen tank to the charging port on your accumulator.   It is threaded with a female 1/4" NPT to allow you to attach directly to your charging line or the quick-coupler of your choice. Plastic sealing discs are included.  There are several charging port sealing arrangements but they all have the same thread.