Oh oh. I think you got trouble.
Your Mag 2 has a 1/2" MNPT thread on the output, but a 3/4" barb on the input. You'll need to stretch 1/2" tubing over the barb, or use a short piece of 3/4" tubing and a 3/4"-> 1/2" reducer.
Is that a Pondmaster? Usually it’s the Pondmaster pumps that have the barb fitting on the suction end, while the Danners have a 1/2" FNPT thread. Same pump...just a different impeller housing.