You gotta love when they do stuff like that
You can probably find one that will fit at HD or Lowes or even a local plumbing supply company instead of waiting on them for another week or so. On my Rainbow Lifegard mech module they forgot the o-ring on it as well and I used a rubber band and plumbers tape to seal it, seems like DIY just seems to apply to everything
Looking good though!
waiting paitently..... 
