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do you work around medical care? if so you can ask the folks at the lab to sell/give you a few of the stoppers that is how i replaced mine.if not medical supple stores do carry them some will even give them to you since the do not need to be still sealed in their package for your use.they come in different colors too.you can also buy glass tubing bent at differnt angles but not all med supply stores carry.
happy bird feeding
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