Thanks Stu.Head Odors 101.1 - "T" into sink drain: http://c34.org/bbs/index.php/topic,5755.msg38216.html#msg38216
Just want to make sure I understand you setup. The head sink outlet and the head pump inlet share the same thru-hull. Correct? The shower sump is not on it's own in your setup.
The C310 is slightly different but if I have your setup right it would be easy to change to something similar.
Jesse