adapter for megaflow hose

I have a All-Glass Megaflow Model 2 sump. I'm trying to connect it to
my LifeReef PreFilter. The LifeReef pre-filter has a 1" threaded male
adapter coming out of the bottom, and a 1" barbed adapter that connects
to that. I don't understand this "vacuum" style hose that comes with
the Megaflow sump. It's a strange size. It seems to be somewhere
between 1" and 1 1/4". The vacuum hose is too big for the 1" adapter
coming out of my LifeReef, but it's to small for a 1 1/4" adapter. The
PVC stand pipe that goes into the sump itself seems to be 1 1/4". The
vacuum hose fits over it, but it's very tight, which I guess is good.
Anyway, any suggestions on how to connect this vacuum hose up to the 1"
output coming from the LifeReef prefilter? Should I just get rid of
the vacuum style hose and create something with flex tubing? Any
suggestions appreciated. Thanks.

Steve