changing a regular skimmer to a hang-on ?

I purchased a Berlin Classic Protien skimmer and not knowing what was best for me I have the regular one, when the hang on would best fit my set-up.
I can't exchange it without a reciept. I want to know if I can convert the one I have to a hang-on?
My problem is that the one I have has a pump on it and I can't fit it into my wet/dry filter because I already have one in there that returns the water into the tank.
ANY SUGGESTIONS ARE WELCOME!
 
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