We are currently house sitting.
So, the first stern shower we installed has never worked the way we wanted it to - it just dribbles out. It is, we think, because it is hot and cold water. The white hose that connects to the stern shower first connects to a T where the boats hot/cold water 1/2" hose connects and where the boats 1/2" cold water hose connects. After the T splits the water (restricting it) then goes into the white 1/2" hose and is split all the way to the shower head, hot in one side and cold in the other (restricting it). So it never worked well. We have another wash down connection like the one we have at the bow for washing down the anchor rode. We are installing it here for a stern shower that will actually work, but with just cold water. Here in Mexico, most of the time cold water is just fine. In our nice head shower we have hot and cold if we need to go for a full blown shower.