Slip-in Eyeballs for 3/4" Pipe??

My pool has 3/4" returns with nothing in them currently. It's just a bare 3/4" pipe. I want to install eyeballs so I can direct the flow but I can't find any to fit 3/4" pipe. Is it an impossible task?

In a 3/4' pipe the eyeball outlet would be quite small.
 
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