Yes the vent "T"s do work. I installed 1½" sanitary "T"s on my vent stacks and the stink, while driving down the road with the window open, went away. They do act as ventures with the ends being larger for the slip fit. I didn't have a problem when parked, so the spinning action of the Xtreme Vent wasn't necessary for me. At 89¢ each, from Home Depot, it was worth a try.
Richard & Michêle Shields
95 Bounder 32H F53