"jon" wrote in message
...
Looking at the diagram, I'd imagine that C is the most optimal solution.
But
could I get away with either A or B.

http://pg.photos.yahoo.com/ph/engine...ac1c.jpg&.src=
ph

C is optimal, and I would go for that. B is next best. Avoid A. The only
time A is effective is when you have a large bore high pressure cold mains
pipe, which I doubt you have.