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5mm borosilicate glass tubes fit in all rubber stoppers & attach to 4.8 mm plastic or rubber tubing.
This tubing fits very tightly in #3 and smaller stoppers. Use Vaseline or cooking oil to help insert the tubing into the stopper, holding the tubing with a cloth to protect your hand if it breaks.
Note: HST has not tested this product for compliance with food safe requirements.
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