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Anatomy of an RV Water Leak

Postscript to Anatomy of an RV Leak

My wife said that I’m “fearless” when I do RV repairs. On the other hand, I’d describe my attitude as something between the OZ’s Cowardly Lion and a bull in a China shop.

Anyway . . .

On our last (actually our first) Sea View RV outing, I noticed water leaking into one of our motorhome’s basement compartments. At first I brushed it off, hoping it would just solve itself and go away, but the water just kept a coming.

So when we returned home after our outing, I decided to try tracking down the cause of the water leak.

Here’s the story . . .


I first noticed water on the lid of the SEWER hose bin

Water was dripping from this opening above the SEWER bin


The leaking water lines ran underneath our shower tub and were pretty much inaccessible.

At first I thought the leak was coming from one or both of the basement 90-degree water line connections. But I wasn’t sure, and even if these connections were the cause, I couldn’t access them.

So . . .

First, a small hole saw opening, then a 2″ x 6″ cut in the Sea View’s driver side wall

Now I was able to confirm that the leak was not coming from either of the water line’s 90-degree fittings


Now I knew that the leak originated under the shower tub . . . somewhere.

I decided to make another inspection hole so that I could see under the tub near the shower faucet . . .

The cut in the wall is near the water lines from the shower. (The cut in the floor was to check for possible obstructions.)

When I looked through this second hole, I found the water leak.


To pin down the exact thing that was leaking, I figured the leak had to originate in the shower controls.

First, I unscrewed the shower controls so that I could see behind it

Then I turned on the water pump. After a few minutes the hot water line (Red) started getting wet – the Leak!

The Culprit – the 90-degree fitting on the top of the hot water line.

Anatomy of Our RV Water Leak (click on drawing to enlarge)


Originally, I did not want to attempt to fix the leak. We are leaving on another RV trip this Wednesday, and I didn’t want to do anything that would put our Sea View out of action.

But what the hell . . .

So, I needed to remove the leaking fitting and replace it with another. Easier said than done.

First, remove the shower head controls. No problem.

Next, remove the leaking fitting (a 1/2″ PEX elbow). Dicey. I used my Dremel tool with a rotary cutting head.

Finally, enlarge the shower head control opening so that attaching a new fitting wouldn’t be a problem.

Enlarged the shower control opening by 1/2″ in order to get a new 90-degree elbow on the hot water line (Red)

Shower controls lowered by about 1/2″. Hunky dory.


Patching those holes . . .

Before & After – Hole in RV Side

Before & After – Inside Hole turned into a Vent

Calico Cat on our Roof

8 Comments Post a comment
  1. Nj #

    Seems like u were always that way, Tom….just dive right in!

    November 28, 2021
  2. Sister Mary #

    Tom, you did exactly what a professional plumber did to my bathroom walls.. looking for pipes that had disconnected.. somewhere behind those walls.. After an initial 4″square hole in one area, he went on to the second hole of 5″ x 10″, and then a final cut of the drywall about 2feet x 1.5 feet.. he found the problem. So, your methods were sound and obviously successful. BRAVO TOM !! The plumber figured that the old soldering had failed and the pipe separated. He fixed it immediately and all my smelly problems were solved.. HOORAY !! Now drywaller must stop by for estimate to repair the drywall. Guess I’ll be painting the bathroom in January.
    Glad you could find the pesky leak and repair it so swiftly. Way to go Tom!

    November 28, 2021
  3. Sister Mary #

    PS Love the Calico cat on roof shot.. wayyyy cool.

    November 28, 2021
  4. T. Mark JAMES #

    How I wish I had your enthusiasm for any project on my coach.

    November 28, 2021
  5. Leo Gene Soares #

    Tom, I bought a DEPSTECH Dual Lens Industrial Endoscope from Amazon, it really helps in looking for problems in inaccessible places in the motorhome.

    November 28, 2021
  6. Tim Furdek #

    Not only are you fearless, but also patient as a Buddha fixing problems in small spaces. I can just feel my knees crying out trying to repair this leak . . . Good job Uncle Tom!

    November 28, 2021

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