Cork Stoppers without Holes for Test Tubes

Cork stoppers without holes for test tubes, available individually or as replacements for the Water Workshop 120036. Natural material, simple and functional. Inner diameter 1.8 cm.

At a Glance

• Natural cork: warm, lightweight, smells like cork
• Inner diameter 1.8 cm: fits standard test tubes
• No hole: creates an airtight seal
• Replacement: for the Water Workshop 120036
• Standalone use: works in other projects too

How Children Use It

A child presses the cork into the test tube, feeling the resistance and hearing a gentle creak. The glass is now sealed—water, sand or a secret stays inside. The cork comes out again with a satisfying pop. Wood and glass become a little laboratory, a secret box, a world to observe.

Safety & Materials

Shipped from Germany. Institutions may request invoice payment by e-mail.