Feeder for ants in 18mm. test tube. Because each test tube is vary in mouth's thickness, some tube might not fit. If it can't slide in your tube with ease, don't force it.
I've upload 2 size of model - OD18 for tube that has ID 15.5mm.(most tube can use this) - OD18S for smaller one ID 15.1mm.
You only need a small cotton ball to close the hole.
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Test tube ant feeder
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