Well, I pulled the trigger on one also. Your measurement would indicate that it won't fit in a reliance container. But that pump looks like the same as the one used by coleman in the youtube vid I posted. I figure if it doesn't work I can get a different water container. We've been using the solar shower with some success, but we've been running into issues of where to hang it the last couple times out. And the weight of a full bag actually snapped one of our privacy/shower tent poles. So this would solve that problem.
Wade
1997 LX450, factory lockers, lift, ARB front, Kaymar rear, 315/75/16 Pro Comp MT's, etc...