I'm glad you brought this up as I've had a question but no one to ask. I had one of these on my previous TT as well as on my present one. In retrospect, I wonder how functional this really is. I understand how the Venturi principle works and coupled with a wind vane, this should allow a steady stream of air to exit whenever a breeze is blowing. My assumption is that it works only when the flush valve is open, which is a desirable thing but not quite what most of think happens.
As I understand the BW system, the roof vent permits an easy release for gas buildup, and then when the dump valve is opened is permits an inrush of air to allow the tank to empty freely. Would it not take a 2nd vent on the tank to permit a constant flow of air that is implied by the advertising?
Air Safe Hitch, Reese Dual Cam 800#, Centramatics