Description
The 3-way stopcock Czako with threaded stopcock retainer NS 18,8 is a precision laboratory glassware component for controlled fluid routing in chemical and analytical apparatus. It features a standard ground joint of NS 18,8 together with an NS-PTFE plug that delivers reliable sealing and smooth rotation. Bent tube connections measuring 10 × 110 mm and a 4 mm bore provide practical flow paths while the design conforms to DIN 12563. The integrated threaded stopcock retainer locks the plug securely in position, helping prevent accidental displacement under vacuum or slight over-pressure. Offered as a single piece with a net weight of 0,076 kg, the stopcock integrates readily into custom glass manifolds, distillation trains and multi-line setups. Produced by Witeg, this Czako-type three-way valve combines dimensional accuracy with the chemical resistance of a PTFE plug, making it suitable for a broad range of solvents and reagents encountered in research and quality-control laboratories. Its compact form and standardised joints support straightforward assembly and interchangeability within existing glassware systems.
This article is part of Stopcocks & valves, in Tubing, hoses & fittings.
Key features
- Pack size: 1 pc(s)
- Type: 3-way stopcock according to Czako
- Joint size: NS 18,8
- Plug: NS-PTFE 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 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.