This last week I had the opportunity to replace or failed shower drain.

I learned more about the plumbing on the 4788 that I guess I ever wanted to know. Of course the obvious that we all know is that we have a black water tank to hold the sewage, and all of the gray water (sink drains, and shower drains) just goes overboard with no holding tank. We have had no problems with the sewage side of the system, just the gray water in the bathroom sinks and master stateroom shower.

Some of the sinks like the galley sink and the bar sink are high enough that they just drain overboard directly. The sinks in the head, and the showers though are too low to directly drain overboard, and they need to be pumped.

The shower in the guest head has its own pump that you need to turn on when you use the shower that pumps overboard when it is in use, and that has been working fine, we assume since we have never actually used that shower.

Both of the head sinks, and the shower in the master drain into a catch basin that has a float switch and a pump to pump overboard. It is basically an automatic bilge pump inside of a “Tupperware” style container. So if you run the sink in the head to wash your hands it may put enough water into the catch basin to turn on the pump, or it may not. That way the pump only turns on when it is half full and needs to be pumped out. Well this whole system failed, and I discovered this while taking a shower. The pump was not working so shower water overflowed and ran into the hall between the guest stateroom and the master stateroom. Once we discovered the problem it was easy to get it dried out with fans, but the next step was replacing the unit.

Fortunately this was an easy unit to replace. 2 wires, and 3 hoses and the new one was installed. As far as on-board repairs this was one of the quicker ones to do, once I figure out that exact part that I needed.

The Rule Industries White Standard 98B Shower Drain Kit 800 GPH 12V was an exact fit for the replacement.