I used half inch copper pipe for mine. They have flat caps to put on the ends. I soldered ( but you can glue ) the cap to a jewelry finding of a leave( that I flattened with a hammer ) just so I'd have more surface area for the glue to stick.

Sorry I couldn't help with the PVC , but copper pipe is now cheap enough to use . ( 10' is $8.99 )

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Another angle ----

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Pic of the copper pipe in the cap -

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Do you have a farmstore around. I got my at a farmstore call Rural King...Oh and if you paint your PVC, use a plastic primer first. It helps keep the paint on better...

I attach my teacup feeders to bud vases, then they slip over a support easily ... makes it much better for clean up too.

Here is a link that might be useful: craf-tea feeders