hello all I need some help with my return plumbing. I'm setting up a sca 50 with shadow overflow. It will be a herbie style overflow with a 1/2" pre drilled return line next to it. Below are pic of the bulk head I just got from BRS. I'm not sure how or what I would use to plumb this to my return pump? Any pics and suggestions would be greatly appreciated. Also what side does the rubber seal go on ?