Pyrex Volumetric Flask Stoppers

These stoppers fit Pyrex volumetric flasks with the following volumes:10 mL25 mL50 mL100 mL (and one for a VWR brand flask as a bonus)200 mL250 mL500 mL1000 mL2000 mL Printed with PETG, these stoppers are chemical resistant and moderately temperature resistant (probably not dishwasher safe for most dishwashers). They all fit well and are water tight (tested in my lab!). Please feel free to modify and improve my design so we can all benefit!