Stopcock bottles are specialized containers for liquid dispensing and siphoning in laboratories, precision‑manufactured from borosilicate glass 3.3. Featuring a precision glass stopcock on the side of the body, they enable precise liquid dispensing and siphoning transfer through stopcock rotation. Suitable for quantitative liquid dispensing, continuous dispensing, and liquid level control operations, they are essential tools for liquid handling in chemistry, pharmaceutical, and biology laboratories.
To be confirmedCapacity
148 – 286 mmBody O.D.
290 – 540 mmHeight
To be confirmedStopcock Size
Specifications are subject to confirmation with your enquiry.
Please contact us to confirm the available specifications.
* Custom capacities and special specifications are available upon request.
* Standard configuration includes a glass stopcock. PTFE stopcocks are available upon request.
Product Description
Stopcock bottles are specialized containers for liquid dispensing and siphoning in laboratories, precision‑manufactured from borosilicate glass 3.3. Featuring a precision glass stopcock on the side of the body, they enable precise liquid dispensing and siphoning transfer through stopcock rotation. The neck is equipped with a ground glass stopper to ensure sealing during storage. The clear glass body allows easy observation of contents and remaining volume, making them essential tools for quantitative liquid dispensing, continuous dispensing, and liquid level control in chemistry, pharmaceutical, and biology laboratories.
Key Features
Borosilicate glass 3.3: ISO 3585 compliant, thermal shock resistant to 280°C, excellent chemical resistance
Precision glass stopcock: Precision‑ground for a tight seal, smooth rotation, and precise dispensing control
High clarity: Clear glass body allows easy observation of contents and remaining volume
Precision dispensing: Flow rate control through stopcock rotation angle for quantitative and continuous dispensing
Siphoning operation: Compatible with tubing for convenient liquid transfer via siphon
Large capacities: Available in 2500mL, 5000mL, 10000mL, and 20000mL
Quality Assurance
Every unit undergoes rigorous dimensional inspection, stopcock seal integrity testing, and visual examination to ensure smooth, reliable dispensing and siphoning performance.
Note: Stopcock bottles are designed for quantitative liquid dispensing, continuous dispensing, and siphoning operations. The stopcock should be cleaned promptly after use to prevent residue from hardening and causing sticking or seal failure. For long‑term storage, apply a small amount of lubricant (e.g., petroleum jelly) to the stopcock to maintain smooth operation.
Applications
Typical Uses
Chemistry labs
Quantitative liquid dispensing, continuous dispensing, and siphoning of various solutions
Pharmaceutical industry
Dispensing and transfer of purified water, buffer solutions, and pharmaceutical liquids
Biology labs
Dispensing and siphoning of media, buffers, and washing solutions
Educational labs
Liquid dispensing and siphoning demonstration in university and high school chemistry labs
Food testing
Dispensing and transfer of solvents for food sample preparation
Compatibility Recommendations
Bottle + Glass Stopcock
Standard configuration for most aqueous solution dispensing and siphoning
Bottle + PTFE Stopcock
Recommended for organic solvents and corrosive liquids
Bottle + Ground Glass Stopper
Ensures sealing during storage
Bottle + Tubing
Compatible with tubing for siphon transfer operations
Tip: Stopcock bottles are professional tools for liquid dispensing and siphoning in laboratories. Clear stopcock bottles are suitable for general solutions, while amber stopcock bottles are recommended for light‑sensitive solutions. For organic solvents and corrosive liquids, we recommend PTFE stopcock configuration.
Operation & Maintenance
Stopcock Bottle User Guide
03
Before Use
Inspect for cracks, chips, or scratches before use
Ensure the bottle is clean and dry to prevent contamination
Check that the stopcock rotates smoothly — no sticking or looseness
Verify stopcock seal integrity — no leakage when closed
04
Dispensing Procedure
Pour solution slowly down the inner wall to avoid splashing
Seal the neck with the ground stopper
Place the receiving container under the stopcock
Gently rotate the stopcock, adjusting the angle to control flow rate
Rotate the stopcock back to the closed position once the desired volume is reached
05
Siphoning Procedure
Attach tubing to the stopcock outlet
Place the other end of the tubing into the receiving container
Open the stopcock to start siphon transfer using the liquid level differential
Close the stopcock and disconnect the tubing after operation
Rinse the stopcock and tubing with distilled water
06
Cleaning & Maintenance
Clean promptly after use to prevent residue from hardening
Remove the stopcock and clean the bore with detergent and a soft brush
For stubborn residues, soak in dilute acid or specialty cleaning solution
Allow to air‑dry inverted on a draining rack
For long‑term storage, apply a small amount of lubricant (e.g., petroleum jelly) to the stopcock to prevent seizing
Care & Notes
Show care & notes
Safety Notice
Always inspect for cracks or damage before use — damaged bottles may break during use
For organic solvents, we recommend PTFE stopcocks to prevent glass‑to‑glass seizing
Do not
Do not force the stopcock if it sticks — check for crystallized residue blocking the bore
Do not apply excessive force when rotating the stopcock — this may damage the stopcock or the bottle
During siphoning, control the flow rate to avoid overflow
Handle with care — avoid impact and rough handling
