What is the purpose of a rubber stopper?

Tapered Rubber Stoppers & Plugs - Plasticoid Company

are made from high quality premium rubber to work as stoppers for jars, vials, test tubes or minor leak stops.

Assorted Rubber Stoppers

Rubber Stopper - #8 With Hole

Universal Rubber Stopper - Size No. 11-11.5 (With Hole)

Laboratory Rubber Stopper: Most Up-to-Date Encyclopedia, News

Rubber Stopper,Solid Rubber Stopper,1-Hole Rubber Stoppers,Rubber

Rubber Stopper Wholesale for Infusion Bottles Vials

Holes in Rubber Stoppers - HOMEBREWING FOR CHEAPSKATES AND ANARCHISTS

Rubber Stoppers- Chemistry Lab are sold with one-hole, two-holes, or as solid rubber, and there are 16 different sizes of rubber stoppers available.

Rubber Stoppers, 1 lb, Size #5-1/2, Black, Two-Hole

12mm Rubber Stopper at Rs 15/piece in Ghaziabad

Stoppers Fisher Scientific

Recessed Self-Adhesive Rubber Stoppers - BS17 - Bumper Specialties

These two-hole black stoppers are made of solid natural rubber that stays pliable over a long period of time. Ideal for use with non-aggressive or

Rubber Stoppers, Two-Hole, Black, Natural Rubber

Conical Stoppers - General Purpose Labware - Plastilab - Products