Hey Jerry,

not true in the sense of all fittings are created equal...Vent fittings do not have the grade or sweep of drainage fittings as these are only to permit air flow. The graded back to drain issue is to prevent any pooling. I'm not trying to confuse the issue but vent fittings can tee into a stack vent, so again, I was asking clarification if this is a vent or drain.