Quote Originally Posted by mattkosem View Post
Agreed. The package came promptly, and was packed very professionally. When I requested instructions (I know, picky picky), he responded within an hour. I'll (hopefully) be installing mine tomorrow, but I haven't heard back on how likely it will be to re-use my existing o-ring yet. I don't have any CPU air cooling around, and don't want to be without a rig while I wait for a new ring to come. My pump is only about a month old, but I don't know if that necessarily means anything.

--Matt
I did not use the stock o-ring. If you look at the inside of the top, you should see a lubricated o-ring already seated in the o-ring cavity surrounding the spot where you place the motor and impeller.

Follow the installation instructions, and you're set!