The #6 rubber stopper is roughly 25mm (1) tall, only $0.80 for one with discounts for volume and is included with the following glassware in
StonyLab Silicon Rubber Stopper, White Tapered Lab Seal Silicone Stoppers Rubber Plugs (10-Pack, 7#)
20pc XL High Temp Silicone Rubber Tapered Stopper Plug Kit Powder Coat – High Temp Masking Supply
DESCRIPTION , These #6 rubber stoppers are 26-32 mm in diameter with one 5 mm diameter hole. , MORE INFORMATION BOX , CONTENTS TAB , SPECIFICATIONS
Rubber Stopper, #6, 1-hole
Rubber Stopper, with Airlock Hole, no. 6
No. 6 Stopper - Drilled
4 Pack #6 Rubber Stopper Airlock Hole Bung Jug Wine Drilled Gum Size 6 Beer Wine
Solid Rubber Stopper, Autoclavable, #6, Black, pack/12
6 Rubber Stopper No Center Hole, Tapered Plugs 1 1/32 To 1 1/8, 26mm To 29mm
Rubber Stopper, with Airlock Hole, no. 6
DESCRIPTION , These #6 rubber stoppers are 26-32 mm in diameter. , MORE INFORMATION BOX , CONTENTS TAB , SPECIFICATIONS TAB
Rubber Stopper, #6, solid
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