Description
3-Way stopcock Czako PTFE NS 18,8 is a laboratory stopcock designed to the Czako principle for precise three-way flow control in glassware assemblies. It carries a ground joint size NS 18,8 and is fitted with an NS-PTFE plug plus capillary connectors of 9 × 100 mm. The bore diameter of 2,5 mm accommodates higher throughput while maintaining defined flow paths for liquids or gases. A threaded stopcock lock secures the plug in position during operation. Conforming to DIN 12563, the unit from manufacturer Witeg is intended for integration into standard conical-joint systems in chemical, analytical and preparative laboratories. It is supplied as one piece with a net weight of 0,07 kg. The PTFE plug provides chemical resistance and smooth turning, while the capillary ends allow straightforward connection to tubing or adjacent glass components. This three-way configuration supports flexible routing without apparatus disassembly, making the stopcock suitable for research, quality control and educational applications that demand reliable, compact flow switching.
This article is part of Stopcocks & valves, in Tubing, hoses & fittings.
Key features
- Pack size: 1 pc
- Joint size: NS 18,8
- Plug material: PTFE
- Bore diameter: 2,5 mm
- Capillary connectors: 9 × 100 mm
- Standard: DIN 12563
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Questions about Stopcock, Czako. three-way, ST 18,8
What is this article?
Stopcock, Czako. three-way, ST 18,8 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.