You can download the Crown Head
from here Raritan Crown Head Owners Manual
If you can't find the info you need in it, call Raritan
tech support...800-352-5630 and select "tech support." Unlike tech support at most mfrs, a live trained tech will actually answer the phone!
Should have mentioned... There have been several incarnations of the Crown Head
...the CD (centrifugal discharge) version is the most recent, but that still makes it 25+ years old. If yours is an earlier STD or DD version, I can find the owners manuals
in my hard copy files.