|Like many other posts I write, we are breaking new ground here, inventing new and untested procedures, and we have no idea whether our devised solution will actually do the intended job. See BIG FAT DISCLAIMER.|
|This sump pump check valve is what we found to accomplish that goal - although our plan was essentially to install it backwards. In other words, we are not trying to prevent the backflow of water - we are trying to allow the escape of water while having the flapper prevent the re-routing of air. |
We bought this model because it was available locally at Home Depot - there are others on the market. Be sure that whatever you choose is not too tall for your application. Normally, when used on sump pumps, there is no concern about clearances, so many of them are long.
|There is the little flapper in the device. The end you are looking into here will be the end pointing down into the gray water tank.|
|This is the view from the opposite end, with me sticking my finger into it to raise the flapper enough for it to be seen through.|
|My husband looked at this cartoon and said, "Just be grateful that our Interstate has separate gray and black tanks!" No sh*t, pun intended!!|
Here is the general procedure for locating and installing this kind of relief check valve on a gray water tank.
|Action shot - drilling the new hole to receive the check valve assembly. Best not to screw up this placement because you don't want a do-over here.|
|Our bulkhead fitting came with a nice large rubber gasket and we suspect it does not have to be sealed in place - a good tightening with a wrench should suffice given that it's on the top of the tank and should see little, if any, submergence.|
Stay tuned for Part 3 where we re-install the gray water tank with this new emergency overflow check valve port in place.
|And that, ladies and gentlemen, is the Airstream Interstate in a nutshell. One of the forum users (I forget who) aptly described them as follows: "As many have observed, the Interstate is brilliantly designed but shoddily executed. If you are willing to work through the shoddiness, you will be rewarded by the great design." We could not have said it better ourselves, as we keep discovering one shoddy flaw after another. |
BTW, I do not create my blog memes - I find them as-is on the internet (it's all about the keywords). I consider it a personal challenge to find just the right meme for any given post. Sort of like the way some ladies can find the perfect flower arrangement for the dinner table.