橡膠實驗塞

Standard-sized Lab Stoppers come in three configurations:
•    No Hole
•    One Hole
•    Two Hole
Bottle Stoppers are available in standard sizes and a variety of materials.

Rubber Stoppers Applications
Laboratory rubber stoppers - Rubber stoppers are often used to close test tubes and flasks to prevent liquid from escaping. 
Rubber wine stoppers - Rubber stoppers are often used for wine bottles
Vial Closure