Polyethylene can be bonded, but it's not easy, because you probably have a nylon barb, and the cyano acrylate won't bond to it very well. I spent countless hours Googling over glue specs... You don't want to know what would actually bond both nicely.
The Goop is a sealer, and not so much a glue, so keep that in mind! It's not going to hold the two pieces well at all.
In your position, I'd pick up the polycarb top, and a short section of polycarb pipe (also from McMaster) and use IPS' Weld-On #4. Nice, clean, elegant, and rock solid. If it leaks, then seal it with Goop.
I believe I have some left over polycarb piping, but I'd have to check: I think it's 5/8" OD though (gotta check!) but 1/2" flexible tubing can be made to fit over it.
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