Description
The 3-way stopcock according to Czako with capillary joints NS 19 is a precision laboratory glass valve for routing and isolating gas or liquid streams across three ports. It features a solid NS plug together with capillary connectors measuring 9 x 100 mm and a bore of 4 mm, and it conforms to DIN 12563. The NS 19 ground joint provides a standardised conical interface that mates with matching laboratory glassware for secure, leak-resistant connections in vacuum lines, gas manifolds and general fluid systems. Supplied as a single piece from manufacturer Witeg, this Czako-type stopcock suits analytical chemistry, preparative workflows and quality-control laboratories needing a compact three-way switching element with capillary outlets. The solid plug supports a reliable seal during repeated open–close cycles, while the larger bore and capillary dimensions favour higher flow relative to smaller NS variants and connection to narrow-bore tubing. Typical uses include stopcock, cone-valve and shut-off duties in glass apparatus, vacuum benches and gas distribution setups. Net weight is 0,07 kg, keeping the component convenient to handle when assembling or modifying laboratory glassware.
This article is part of Stopcocks & valves, in Tubing, hoses & fittings.
Key features
- Pack size: 1 pc(s)
- Joint size: NS 19
- Connector type: Capillary joints
- Capillary dimensions: 9 x 100 mm
- Bore diameter: 4 mm
- Standard: DIN 12563
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Questions about Stopcock, Czako. three-way, ST 19
What is this article?
Stopcock, Czako. three-way, ST 19 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.
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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.