I have an RV that originally came with the outdoor shower faucet that had the attached 3 foot hose/sprayer.
I replaced it with one of those that have the detachable hose, and got a nice long hose and spray head.
Because the shower housing had two large holes in the back for the original hose to come out, I sealed off the housing with gorilla tape, from both inside and out. Now, any water coming from the outside, be it a leak, a bad aim from the shower faucet, whatever.. it will not be getting inside the shower housing.
I don't know if the outdoor shower housings are all the same or not.
2015 Crossroads Sunset Trail Reserve ST26RB
2005 Ford F-150
Doug, my S/O Patience, and Shelby the mutt