Description
2-Way stopcock NS 21,5 with hollow NS glass plug is a laboratory glass valve designed for precise flow control in chemical apparatus. Equipped with a hollow NS glass plug and bent tube connection, it provides a 4 mm bore and conforms to DIN 12553. The NS 21,5 ground joint ensures a tight, reproducible seal for vacuum and pressure applications in distillation, synthesis and analytical workflows. Supplied as one piece with a net weight of 0,088 kg, the stopcock is compact yet robust enough for everyday bench use. Manufactured by Witeg, it delivers the dimensional consistency and chemical durability required for standard laboratory glassware systems. The two-way design allows straightforward on/off or diversion control without extra fittings. Suitable for research, teaching and quality-control environments that rely on DIN-compliant conical joints, this valve supports clean, leak-resistant operation across a wide range of solvents and reagents.
This article is part of Stopcocks & valves, in Tubing, hoses & fittings.
Key features
- Pack size: 1 pc
- Type: 2-way stopcock
- Joint size: NS 21,5
- Bore: 4 mm
- Plug: Hollow NS glass plug
- Connection: Bent tube
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Questions about Stopcock double bore with hollow plug
What is this article?
Stopcock double bore with hollow plug is the article on this page. Luminix Health distributes Witeg for laboratory use. It sits in Stopcocks & valves, inside Tubing, hoses & fittings, in Labware.
A stopcock opens and closes a line, or directs it between ports. Glass stopcocks have a ground plug that needs grease or a PTFE key. The bore decides the flow. A two-way and a three-way key are different parts.
Tubing is how a liquid or a gas moves between two vessels without being poured. Silicone stays flexible and survives repeated autoclaving. PTFE resists almost every solvent and is stiff. PVC is the ordinary flexible line for water and for mild aqueous work. The fitting, not the tube, is what usually leaks: the barb, the thread and the stopcock have to match the tube bore. Glass and plastic apparatus around these lines is indexed under ISO laboratory ware.
Which category should I open next?
The category is Tubing, hoses & fittings. The sub-category is Stopcocks & valves. The catalogue is Labware.
Shelves beside this one are Hose connectors, adapters & fittings, PVC, PTFE & other tubing, Silicone tubing and Tubing accessories.
What should I check before I order?
When this page shows a safety data sheet, use that manufacturer file. Hazard text does not belong in the sales description. For a pack size, a grade or a certificate that is not on the page, send a quote request or contact the team.
How does ordering and shipping work?
Luminix Health distributes this article from the heart of Europe. Delivery across Europe, two to five days when in stock. Standard delivery is free from €250 excl. VAT. Cold-chain goods and dangerous goods under ADR are never included in that free delivery. The terms are in the Shipping Policy. The full brand index is on shop by brand. Who we are is on about us.
Which other categories should I open?
The seven catalogues are Labware, Lab chemicals, Lab instruments, Lab consumables, Chromatography equipment, Lab safety equipment and Life Science & Microbiology.
