Description
Product Overview
The Nylon 1-Way Stopcocks offered by Tomopal Inc. are precision‑engineered components designed to provide a reliable one‑directional flow control solution for a wide range of industrial and scientific applications. Constructed from high‑grade nylon, these stopcocks combine chemical resistance, mechanical strength, and low friction to ensure smooth operation even under demanding conditions. Each unit features a standard Luer slip connection that mates seamlessly with ¼” ID tubing, allowing quick and secure installation without the need for additional adapters or tools. The stopcocks are non‑sterile, making them ideal for laboratory environments where sterility is not a primary requirement, such as diagnostic gas analysis (DGA) testing, fluid sampling, and equipment calibration. With a capacity of 50 ml per stopcock, the product is perfectly sized for use with both 30 ml and 50 ml glass syringes, providing flexibility for various testing protocols. The packaging includes 50 individual stopcocks, each individually inspected for dimensional accuracy and functional integrity, ensuring consistent performance across the entire batch. Detailed specifications include a package dimension of 8 × 6 × 3 inches, a net weight of 8 ounces, and compliance with industry standards for Luer fittings. The model number CN and the ASIN B09WD7FNWW further identify the product within Tomopal’s catalog, while the best‑seller rank of #63 in Luer Stopcocks highlights its popularity among professionals seeking dependable flow control solutions.
![[Product front view showing all components]](https://www.healthyfamily.store/wp-content/uploads/2026/08/cd273b2f06ab4384a97adfd03564fca3.jpg)
Usage
These stopcocks are specifically designed for environments where precise fluid control is essential. In DGA testing kits, the stopcocks enable technicians to direct gas samples from the testing apparatus into 30 ml or 50 ml glass syringes without risk of backflow, ensuring accurate measurement of dissolved gases. The one‑way design prevents contamination of the sample line, which is critical when analyzing trace amounts of gases such as hydrogen, methane, or ethane. Beyond DGA testing, the stopcocks are suitable for a variety of applications including pneumatic control circuits, hydraulic fluid routing, and laboratory reagent dispensing. Their nylon construction offers resistance to many chemicals, making them compatible with solvents, oils, and aqueous solutions commonly encountered in industrial maintenance and research settings. The Luer slip interface simplifies integration with existing tubing networks, allowing users to quickly replace worn components or reconfigure fluid pathways with minimal downtime. Because the stopcocks are non‑sterile, they are best employed in processes where sterility is not a regulatory requirement, such as equipment calibration, leak testing, and routine fluid handling. The 50 ml capacity provides ample volume for most sampling tasks while maintaining a compact form factor that fits easily into standard laboratory racks and toolboxes.
Why Choose Us
Choosing Tomopal’s Nylon 1‑Way Stopcocks means selecting a product backed by a reputation for quality and reliability. Tomopal Inc. has a long history of manufacturing precision fluid control components for the industrial and scientific markets, and each stopcock undergoes rigorous quality assurance testing before it leaves the factory. The use of premium nylon material ensures that the stopcocks can withstand temperature fluctuations, mechanical stress, and exposure to a broad range of chemicals without degrading. This durability translates into a longer service life, reducing the frequency of replacements and lowering overall operational costs for users. Additionally, the design of the stopcocks incorporates a smooth internal surface that minimizes pressure drop, enhancing the efficiency of fluid transfer and reducing the risk of cavitation in high‑speed applications. The one‑way valve mechanism is engineered to provide a tight seal when closed, preventing backflow and protecting downstream equipment from potential damage. Tomopal also offers responsive customer support and technical assistance, ensuring that any questions regarding installation, compatibility, or performance can be addressed promptly by knowledgeable staff. With a competitive price point of $96.50 for a pack of 50, these stopcocks deliver exceptional value, especially when compared to alternative solutions that may require additional fittings or higher material costs.
Key Features
- Durable nylon construction provides chemical resistance and long‑term reliability in harsh environments.
- Standard Luer slip connection fits ¼” ID tubing for quick, tool‑free installation.
- One‑way valve design prevents backflow, ensuring accurate sample collection and system protection.
- Compatible with 30 ml and 50 ml glass syringes, offering flexibility for various DGA testing protocols.
- Responsive customer support and technical assistance from Tomopal’s experienced engineering team.
FAQ
What tubing size does the stopcock accept?
The stopcock is designed for ¼” inner‑diameter (ID) tubing, which is the standard size for most Luer‑type fluid connections used in laboratory and industrial applications.
Can these stopcocks be used with sterile processes?
These stopcocks are supplied as non‑sterile components and are intended for applications where sterility is not a critical requirement, such as DGA testing, fluid sampling, and equipment calibration. For sterile processes, a certified sterile version should be selected.
What is the maximum pressure rating for the stopcocks?
While the exact pressure rating depends on the specific system configuration, the nylon material and one‑way valve design are suitable for typical low‑ to moderate‑pressure applications found in laboratory and pneumatic systems, generally up to 5 bar (≈72 psi).
How many stopcocks are included in each package?
Each package contains 50 individual Nylon 1‑Way Stopcocks, providing a convenient bulk quantity for laboratories, maintenance teams, and manufacturers who require multiple units for routine use or inventory stocking.
Are the stopcocks compatible with other brands of syringes?
Yes, the Luer slip interface is a universal standard, allowing the stopcocks to connect with syringes from a wide range of manufacturers, provided the syringe has a compatible Luer tip and the tubing matches the ¼” ID specification.







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