cockpit shower

We are new to us owners of a 2008 Hunter 38. We needed to replace the cockpit shower and noticed the PO had disconnected the cold water supply to the shower. Tracing the disconnected line we noticed the cold line was going to a on/off valve, then to a T-connection that tied in the shore inlet...

I need to replace the transom shower hose on my Hunter 45CC. The hose is broke off behind the box where it connects to the water source. The only access from the back, in the locker, is a small covering that is not close to the box. I can barely touch the area, but certainly cannot reach it...