Quick Answer: The Red Rubber Stoppers One Hole 13mm are size 13 red rubber bungs with a single 5 mm hole, measuring 13 mm at the bottom, 16 mm at the top and 24 mm in length.
Last updated: October 2026
Key Features
One hole of 5 mm diameter
Bottom 13 mm, top 16 mm, length 24 mm
Red rubber with Shore hardness of 46-55
Bottom diameter moulded on the top face
Suits a 50 ml conical flask or 18 mm diameter test tubes
Technical Specifications
Specification
Value
Bung type
One hole
Hole diameter
5 mm
Size
13
Bottom diameter
13 mm
Top diameter
16 mm
Length
24 mm
Shore hardness
46-55
About This Product
A size 13 rubber stopper with one hole, so glass can be passed through it into a 50 ml conical flask or a test tube of 18 mm diameter. Extreme care must be used when inserting glass into the hole. The rubber has a Shore hardness between 46 and 55. Export supply of the Red Rubber Stoppers One Hole 13mm can be arranged to laboratories and schools in Palestine, Turkey, Kuwait, Timor-Leste, Oman and Guinea-Bissau.
Frequently Asked Questions
Q1. What precaution applies when fitting glass into the hole? Extreme care must be used when inserting glass into the holes in rubber stoppers.
