3.5x3.5 coupling?
 

I've examined the blueprints, and I just can't figure out where the 3.5x3.5 female coupling fits into the goal. The 3" pipe fits neatly inside the Water Closet Flange, and the coupling has the same diameter, so they can't be nested. Anyone figure it out?

yeah, we had the same problem tonight. we just decided to do without the coupler. if any one on your team used a digital camera to take pix of the goals at the kickoff, you might want to refer to these, see if they can yeild the answer.
hope this helps
steph