I purchased mine on Amazon for about $20 last week. Installed this past weekend and so far so good. Very easy to install. I installed mine on the opposite side of the drain. We used ours a few times and only used deodorizer and without a good flush we could really smell the stink in the bathroom. I believe without the good flush i caused my black tank drain to leak a little. Since rinsing no leaks. IMHO worth the investment.
2011 Jayco Jay Flight Swift 264BH
2008 XLT SCab 5.4L, FF, 4X4, 3.55 LS, Gotts Mod w/Drop in K&N, Holley Hooker Aerochamber Muffler, Edge Evolution, Tekonsha P-3 Trailer Brake Controller,33.5" Nitto Terra Grapplers.