without knowing what year and model Cardinal you have, not sure anyone can tell you what it is for your specific trailer.
that's why many of us put our RV info in our signature line.
your owner's manual is the same for all of us, a generic manual that only covers RV systems with nothing in them for any specific model of RV or type of RV.
and Zoe the Wonder Dog(R.I.P.)
'07 Roo 23SS pushing an '07 Chevy Avalanche
Equalizer WDH and Prodigy BC