Figure A and B are against code, as the height difference between the outlet of the trap and the attachment to the vent is too great. This creates a situation known as an S-trap, and can cause the trap to siphon itself empty when the fixture drains. There is no issue with Figure C that I am aware of, other than that it looks kind of funky. I have had to do the same thing many times, and have encountered no problems with it.
Ok, Figure A & B are no good. I understand how they could syphon dry from a physics stand point, but there would need to be a lot of negative pressure for that to happen and the actual stack/soil vent is less than 2 feet away from those fixtures. I've set both of those configurations up already because I did not want to destroy the furniture, nor did I want to open up the wall (which by the way would have required the exact same pipe bends but in the wall rather than out of the wall). Both have been extensively tested and no syphoning issues have been observed. However, for what it's worth, I would like to have everything up to code... so if there is a proper solution to match drain heights, I would love to know about it...any suggestions?
Open the wall and move the santee to where you want it. You can raise it and move it left or right by turning the trap arm parallel to and in the wall with a 90 fitting coming out of wall where you want it. You can change the direction of the trap arm with not more thanone 90 degree or two 45 degree fittings.
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