- Home
- Stop Cocks
Material : Polypropylene / PTFE
HSN Code : 39269099
Polylab offers top rated and best Stop Cocks, designed for precise control of liquid and air flow in laboratory setups. Manufactured using high-quality, chemically resistant materials, these stop cocks ensure reliable performance and accuracy in various scientific applications.
As experienced manufacturers and suppliers, Polylab focuses on delivering high-precision laboratory components that enhance efficiency and safety. The stop cocks are engineered for smooth rotation and easy handling, allowing users to regulate flow without leakage or pressure loss.
Built with durability in mind, Polylab Stop Cocks maintain consistent performance even under frequent use and exposure to harsh chemicals. Their sturdy construction and leak-resistant design make them suitable for long-term use in demanding laboratory environments.
Code | Particulars | Packing |
|---|---|---|
55301 | 2 Way | 6 Pcs |
55302 | 3 Way | 6 Pcs |
Recognized among the best manufacturers and suppliers, Polylab continues to provide dependable lab accessories. These stop cocks are essential for maintaining control, accuracy, and safety in a wide range of laboratory operations.
Laboratory Experiments : Used for controlling fluid flow in various experimental setups.
Burettes & Apparatus : Ideal for integration with laboratory glassware and instruments.
Research Work : Supports accurate and controlled procedures in research environments.
Pharmaceutical Use : Ensures precise handling of liquids in formulation and testing.
Industrial Labs : Suitable for quality control and analytical processes.
Accurate Flow Control : Designed to provide precise regulation of liquid and gas flow in laboratory systems.
Leak-Resistant Design : Ensures tight sealing to prevent leakage during operation.
Chemical Resistant Material : Suitable for use with a wide variety of laboratory chemicals.
Smooth Operation : Easy to turn mechanism for convenient handling and control.
Durable Build Quality : Engineered for long-lasting and reliable performance.
Top Rated and Best Quality : Polylab products deliver consistent and reliable performance.
Experienced Manufacturers and Suppliers : Known for precision and quality assurance.
High Durability : Designed to withstand regular laboratory usage.
User-Friendly Design : Ensures ease of operation and efficiency.
Customer Commitment : Focused on delivering high-quality and dependable solutions.
A 2-way stop cock (Code 55301) has two ports and provides simple ON/OFF control—either flow is allowed between the ports (ON) or completely blocked (OFF). A 3-way stop cock (Code 55302) has three ports and allows more complex flow patterns, such as directing flow from one port to either of the other two, or connecting all ports in various combinations. The 3-way version is ideal for flow diversion, mixing, or selection between different sources or destinations.
The serrated tubulations on these stop cocks are designed to accept flexible tubing with inner diameters ranging from 6 mm to 10 mm. This covers most common laboratory tubing sizes, including standard silicone, Tygon, PVC, and polyurethane tubing. For optimal leakproof performance, ensure the tubing is pushed fully onto the serrated portion to engage all ridges.
Yes, these stop cocks are engineered and manufactured to be absolutely leakproof under normal laboratory operating conditions. The precision-matched polypropylene body and PTFE plug create a tight seal that prevents fluid escape, even under moderate pressure or vacuum. The PTFE plug is self-lubricating and maintains its sealing properties over extended use.
No, the PTFE plug is self-lubricating and does not require any additional grease or lubricant. This is a significant advantage as it eliminates potential contamination of your samples and simplifies maintenance. Simply ensure the plug and barrel are clean before assembly.
Both polypropylene and PTFE are autoclavable materials. These stop cocks can withstand standard autoclaving temperatures (121°C). However, repeated autoclaving may eventually affect the components over time. For sterile applications, autoclaving is suitable, but for general use, cleaning with appropriate laboratory disinfectants is often sufficient.
The pressure rating depends on several factors including temperature, tubing connection security, and the specific fluid. Generally, these stop cocks are designed for low to moderate pressure applications typical in laboratory settings (gravity feed, peristaltic pumps, low-pressure manifolds). For high-pressure applications, we recommend testing under your specific conditions or consulting with our technical support team.
The polypropylene body offers excellent chemical resistance to aqueous solutions, dilute acids, dilute bases, alcohols, and many organic solvents including acetone, ethanol, and methanol. The PTFE plug has even broader chemical resistance and is suitable for almost all chemicals. However, always consult chemical compatibility charts for specific applications involving aggressive reagents.
Disassemble by removing the PTFE plug from the body. Wash both components with warm water and mild laboratory detergent. For stubborn residues, use appropriate solvents compatible with polypropylene and PTFE. Rinse thoroughly with distilled water. Allow to air dry completely before reassembly. Do not use abrasive materials that could scratch the sealing surfaces.
Both 2-way (Code 55301) and 3-way (Code 55302) stop cocks are supplied in economical packs of 6 pieces each. This bulk packing ensures laboratories have adequate supplies for multiple setups, experiments, and backup needs.
Yes, these stop cocks can be used with standard peristaltic pump tubing of matching inner diameter (6-10 mm ID). The serrated tubulations provide secure grip on pump tubing. However, ensure that the tubing is pushed fully onto the stop cock to achieve a leakproof connection, and consider the pulsatile flow characteristics of peristaltic pumps in your application.
PolyLab offers a comprehensive range of high-quality plastic laboratory ware designed for accuracy, durability, and everyday laboratory applications across education, research, healthcare, and industrial sectors.
Copyright © 2026 PolyLab, All Rights Reserved.
