The United Scientific RSTPK2 Rubber Stopper Assortment is a 1lb. bag of solid rubber stoppers in sizes 00 to 7. The stoppers are solid (no holes) and are tapered to fit compatible labware, bottles, flas...

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Product Review

The United Scientific RSTPK2 Rubber Stopper Assortment is a 1lb. bag of solid rubber stoppers in sizes 00 to 7. The stoppers are solid (no holes) and are tapered to fit compatible labware, bottles, flasks, test tubes, and other containers.

United Scientific Supplies manufactures laboratory supplies and science education products. The company, founded in 1992, is headquartered in Waukegan, IL.



  • Tapered Design - Smooth and tapered sides make these stoppers easy to plug and pull. All United Scientific rubber stoppers are reusable, and promote a sustainable laboratory or classroom environment.
  • Natural Rubber - Made from premium natural rubber, not easy to deform, elastic and great for sealing. Manufactured according to laboratory standards
  • Extensive Use - Rubber stopper Ideal for laboratory and industrial use, can be used to seal test tubes, flasks, etc. Available in a wide range of sizes.
  • Low sulfur content. Withstand temperatures from –25 to 70°C (–13 to 158°F). They do contain latex.
  • Size: #00 to #7 Assorted sizes, 1LB stoppers.

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