I realize you're done; but wanted to point out that you can get anti-seep collars in two pieces that you bolt together and don't have to thread on or cut the pipe.

I believe I got mine from here in both 8 and 14 inch sizes. I think they make custom sizes too. No complaints and several positive comments from people helping with them who compared them to ones they normally use.

http://scheibdrainage.com/index.html

[Linked Image from i108.photobucket.com]