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7/8" Solid Rubber Stoppers Tapered Plug Bung Cork Fits 7/8" ID
 

#3 Solid Rubber Tapered Stopper No Hole 18–24mm Lab Flask Bottle Plug

Each quantity option contains the same stopper in a different pack size.
Choose what fits your lab or classroom needs.
Choose a larger pack to keep this common size on hand.

Description

#3 solid tapered rubber stopper for laboratory glassware.
No-hole design provides full closure without tubing.

The tapered body compresses for a secure friction seal.
Used for sealing flasks, bottles, and test tubes.
Suitable for lab, classroom, and general bench work.

Application examples are for reference only.
Fit depends on opening diameter and insertion depth.
Always verify glassware dimensions before ordering.

Specifications

Stopper size: #3
Top diameter: 24 mm (0.94")
Bottom diameter: 18 mm (0.71")
Overall height: 25 mm (0.98")
Material: Black natural rubber
Hardness: 40–50 Shore A
Design: Solid tapered stopper (no hole)
Closure type: Push-in friction fit
Operating temperature: -20°F to 160°F (-29°C to 71°C)
Use environment: Laboratory / educational use

Common Applications

• 125 mL Erlenmeyer flasks
• Laboratory bottles and vials
• Glass test tubes
• Classroom science experiments
• Temporary container sealing

Application examples are provided for general reference only.
Proper fit depends on container opening and taper engagement.

Fit Notice

These stoppers seal by compression along the tapered wall.
Glass tolerance and insertion depth affect retention strength.

Material & Chemical Safety Notice

Natural rubber is suitable for general lab use.
Not intended for pressurized systems.
Not intended for hazardous containment.
User is responsible for verifying chemical compatibility.

Package Options

• Multiple pack sizes available.
• Please use the drop-down box for needed quantity.
• Second quantity option offers the best balance of price and quantity.

Service

Ships from California, USA warehouse
Same-day handling on most weekday orders
Tracking uploaded quickly after shipment
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We hope you will love your purchase, however if you need to return it, we have a 60 day return policy.

We hope you will love your purchase, however if you need to return it, we have a 60 day return policy.

We hope you will love your purchase, however if you need to return it, we have a 60 day return policy.

We hope you will love your purchase, however if you need to return it, we have a 60 day return policy.

We hope you will love your purchase, however if you need to return it, we have a 60 day return policy.

We hope you will love your purchase, however if you need to return it, we have a 60 day return policy.

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This #3 solid rubber tapered stopper provides a secure friction-fit seal for laboratory flasks, bottles, and test tubes with 18–24 mm openings. The 24 mm top diameter and 18 mm bottom diameter taper allow controlled compression in standard lab glassware.

The 25 mm (0.98") height and 40–50 Shore A natural rubber compound create reliable sealing without tubing or vent holes. The no-hole design is ideal for containment, storage, and classroom experiments.

Commonly used in laboratory, educational, and research environments where repeat insertion and removal are required. Designed for MRO teams and technicians working in inch and metric systems.