Return Valve-Pool Devil/Pool Skim

I'm thinking about getting one of those Pool Devils or a Pool Skim, but before I ordered it I thought I should see if I can get that return valve eyeball looking deal to unscrew, which it doesn't do. So before I use the wrong tool and break the thing off I was wondering if anyone had a suggestion on how to get it unscrewed?

As a side note, I only found one review of the Pool Devil, anyone else had luck with it? The Pool Skim looks better, but it's 5 times as much money.

Thanks,

Lloyd
 
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