Theres two versions of these pumps, one has a 3/4 male hose connection on the inlet(I beleive), the other has 1/2" NPT female threads on both inlet & outlet.
I made sure I got the 1/2" inlet/outlet version so I could add my own connections. Home Depot used to sell 1/2" x1/2"NPT brass barbs that fit nicely (stopped sellign them here).
I also replaced the O-ring with a good bead of silicone.
I did not glue the impeller, as I experimented with a small bead of silicone to "glue" it, and it ended up not starting impeller rotation at all - would stall.