Turns out that the circular access hole that was cut in the bed area also cut into the plumbing of the black water rinse hose. I circled the areas in the image where it was cut, the elbow was probably fine, but the cut in the hose went all the way through. I had read that some people found the flow control to be installed backwards, but mine was not. I have to assume the previous owners never used the black tank rinse hose, because it would be hard to miss the amount of water that was pouring onto and under the bed.

I felt like this was within my powers to fix, and here are the parts I bought:

The crimping tool was expensive, but everything else was reasonable. The steps I took were:

I feel like I got up most of the water, there did seem to be some dampness in the channel where the hoses are fed from the pump/heater area on the port side to where they emerge on the starboard side for the toilet/shower. It was certainly an adventure, and I'll know better on my next purchase to test all the water systems before leaving the lot.

Hey,

My first post. Very good article. I'm learning a lot about rv specific plumbing. Learning about pex plumbing. Only had a few encounters with those miserable clamps in past. Did not like them then. Like them even less now. Anyway, in your post, you mentioned a "flow control valve". I have a 2013, 178 pod that I have been working on faucet leak under the kitchen sink. I found the black water rinse hose in my travels but did not see anything like a flow control valve (one way check valve?). Does anyone know if these valves were being installed in 2013 models?

Thanks, rGod.