Description
The 3-way stopcock Czako with threaded stopcock retainer NS 21 is a laboratory glass valve engineered for precise direction of liquids and gases in multi-path apparatus. It is built to NS 21 joint size and incorporates a hollow plug together with bent tube connections of 10 × 110 mm and a 4 mm bore, all in accordance with DIN 12563. The threaded stopcock retainer keeps the plug firmly seated during operation, reducing the chance of unintended movement when systems are under vacuum or modest pressure. Supplied as one piece with a net weight of 0,118 kg, the component is ready for incorporation into distillation lines, reaction manifolds and analytical glass assemblies. Manufactured by Witeg, this Czako-pattern three-way stopcock offers the dimensional consistency and robust construction required for everyday laboratory service. The hollow-plug design and standardised bent-tube ends facilitate clean flow geometry and straightforward connection to existing NS glassware, supporting reliable performance across a variety of chemical and process applications.
This article is part of Stopcocks & valves, in Tubing, hoses & fittings.
Key features
- Pack size: 1 pc
- Type: 3-way stopcock according to Czako
- Joint size: NS 21
- Plug: Hollow plug with threaded retainer
- Connections: Bent tube ends 10 × 110 mm
- Bore: 4 mm
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Questions about Stopcock, Czako, three-way, ST 24
What is this article?
Stopcock, Czako, three-way, ST 24 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. Articles in stock ship within 2–5 business days. 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.