One day shortly after I bought my 5ver my kitchen sink decided to stop draining. I did what anyone would do, removed the p-trap, cleaned it out, and re-installed it. Still wouldn't drain. The clear 45? elbow I have on my 3" sewer line was empty so I knew my sewer hose wasn't clogged. I used a plumbers snake to verify no obstructions between the sewer outlet on the RV and the outlet on the gray tank. So I knew the problem was in the interior pipes, somewhere between the p-trap and the tank. My snake wasn't long enough to go all the way through, so I had to devise a new plan. I decided a nice flush of high pressure water might free whatever the obstruction was. So now the problem was how to use my 3/4" hose to put pressure on my 1?" plumbing. After much research, I could not find an adapter that would work so I went to the hardware store hoping to make something that would work out of PVC. First I found a 3/4" female GHT x 3/4" female slip. Then I found a 1?" female thread x 1?" female slip. Then it was just a matter of finding the adapters and bushings I needed to go from 3/4" female slip to 1?" female slip. It ended up being a 1?"x?" bushing, and a 2" piece of ?" pipe. Put it all into place, test fit, then glued it together. Now I could run my hose through a window and attach it directly to the plumbing without losing pressure or making a mess/getting wet. The water in the sink did drain slowly so I wasn't too worried about a complete seal which might cause the pipe to bust under pressure, but just to be safe I decided to use a ball valve to slowly introduce pressure to the line, so it wouldn't bust if a complete seal occurred. Since then I have had the same problem in my bathroom sink as well, and rectified it the same way, and I've helped a few neighbors here at the campground use it on their plumbing as well.
Pictures of the finished product (with horrible flat black paint job) attached below.
