We are new to RVing and ran into an issue with the sewer hookups that I hadn't experienced before, so I figured I would check here to make sure I didn't do something wrong and just got lucky previously. When I went to drain the tanks the water flowed down the hose too fast for the sewer hook up at the camp site to handle. I have two gray tanks and was draining the kitchen tank first (thank god!) when I discovered there was a problem. Normally I would have drained the black before both gray but I was letting my 9 year old son help out and hook everything up (which I doubled checked before we started the draining process) and thought training on the kitchen gray tank was the better bet.
I use a
Rhino flex hose and a
sidewinder hose support. We hooked the hose to the trailer, ran it down the sidewinder, and put the fitting into the sewer hookup. Since I had my 9 year old helping, I (with gloves on) was still holding/checking the fitting when he opened the tank valve. After about 30 seconds of draining, the fitting started pushing back out of the sewer outlet. I tried to hold it in place but quickly realized it wasn't going to work. Gray water started to leak out. I had my son shut the valve and let the hose drain. I checked the fitting to make sure it was on tight and put it back into the sewer. Joe opened the valve again and less than a minute in, we had the same issue. In the end, we drained all three tanks but with having to close the valve every 30 seconds to let the hose drain.
Fortunately this was only a weekend trip and there wasn't any solids to deal with but now I'm scratching my head wondering if I did something wrong or if this campsite had a questionable sewer hookup. This was only our 4th time out.