need protein skimmer pump help

[Nevs]

I'm new to the sw hobby and recently purchased a used skimmer. Unfortunately I can't seem to find anything about it and it needs a pump. It's a hob del Rey . There is no label listing gph requirements. I do know I am using 3/4 flexible tubing on it. However when I plug the water hose onto the skimmer it floods the air tube and I get no bubbles.
Anyone have any suggestions?

 

[Reefing Madness]

Only Delray I know of is a Wet/Dry Sump, no skimmer.

 

[Nevs]

Bump.
pictures to see if anyone can help.