Chinook RV

I have a leak at the O-ring where the shower hose connection goes into outside shower housing. I cannot seem to find a way to replace the o-ring because I can't see how the shower hose male fitting and t-connection in housing can be separated from housing.

Our shower housings are made with slant and all the new housings I found on-line have flat even housings, not slanted. Anyone know how to change this o-ring, or where I can find replacement housing that has proper slant?
Thanks

If yours is like mine, under the piece that has a small whole you find a rubber flapper. I removed the piece a turned flapper Over and it stopped leaking. I used a pick to lift out the piece with small hole. Hope this helps I think this is so the line will drain after shower pressure is off.

I have the same outside shower. I don't think the black round "o-ring" is for water proofing. It is just a grommet for decorative purpose more than anything. Where is the leak coming from? You do need a round o-gasket that goes inside the hose connector that connects to the plastic threaded piece. It is just like one of the garden hose gasket that you see inside the garden hose connector.