Broken flow manifold housing Emperor 400

So I got this used Marineland Emperor 400 from a friend who also got it used with a bunch of equipment and tanks at an auction. It seemed to work okay except that the flow was not up to par. Nothing like my 280. I took it apart again and noticed that the flow manifold housing (number 6 in this link) was separated under where the spray bars connect. It looks like a clean break at a seam, so I wasn't sure if it was supposed to be like that or was actually broken. I figure that's why it's not pumping right, because it can't get the pressure up.

However, I can't seem to find anyone who sells this part! Online or otherwise. I haven't tried calling Marineland yet because one of the LFSs around me was supposed to see if they could order it and how much. That was 3 weeks ago, not a peep from them, argh! So, I was wondering if I could somehow glue (Gorilla glue, perhaps?) that part together to see if I could save a little cash and effort trying to get this part. At the very least, I could see if that is indeed the problem or not.

Does this sound like a good idea? Anyone have suggestions on how to go about gluing this sucker together or where to get that part?:help2:

Thanks for the suggestions! I'll see what they've got at the stores, but it probably won't be until next week. Thankfully, it's just a wanted upgrade to an Emperor 280 rather than a needed one, lol. It can wait a little bit to actually get done. If you've got more suggestions, I'll take 'em. Do you think I should sand down the seams to get a better hold or leave them as is? Like I said, the break looks pretty clean rather than jagged or uneven. I'll have to take another look at it, but from what I remember, that was the case.

If this doesn't work, I'm gonna call and see if they ever looked into getting that part in, and maybe call Marineland about ordering that part.