I can't get the adapter off with my bare hands. It appears to be PVC glued in place.
It is about 2" from the center of the impellar to the top of the pump housing. The outlet adds another .5", and it appears the female MPT part is glued inside that outlet.
On most of the pics I saw, they had hose barb fittings.. mine doesn't it's female MPT for both.
FTR - I popped the impellar housing off, and it seems that this would be a fairly easy pump to mod with Hahnmeister's extended housing mod.
I got the NW version from Premium Aquatics, I'm going to try it unmodded with the 5Gal water bottle skimmer.
**Edit - oh yeah one other thing.. I think the outlet is 5/8" female MPT. It seems a bit small considering the inlet is 1". I'm not too sure whether I like that or not.