I am replacing all of my bilge hoses and stuff, and I am unsure about how the shower drains are usually done?

This reminds me to stick a camera under there for a visual, but, it doesn't feel like there is a nut of any kind on the bottom, are they just 5200'd to the shower?

I am somewhat inclined to just leave them alone, but in cleaning out one of the shower sump boxes this weekend I noticed the hose is starting to crack, so, they are due.

1972 43DC.

Just wondering if anyone has any prior experience do or don'ts, etc...

Thanks!