Description
1-way stopcock with capillary connectors NS 12,5 is a laboratory glass valve for controlled single-path flow in capillary and fine-line apparatus. It combines an NS 12,5 joint with an NS-PTFE plug and capillary connectors, providing chemical resistance at the sealing surface together with narrow-bore connections suited to precise liquid or gas handling. The bore diameter is 1,6 mm and the stopcock is manufactured in accordance with DIN 12541, supporting standardised interchange within compatible glassware systems. Supplied as one piece with a net weight of 0,044 kg, this 1-way valve is designed for assembly into laboratory setups that require compact shut-off and metering at capillary scale. The stopcock from manufacturer Witeg is commonly applied in synthesis lines, analytical manifolds and vacuum or inert-gas paths where a PTFE-plugged conical stopcock with capillary ends is preferred. Capillary connectors help minimise dead volume while the 1,6 mm bore maintains workable flow. Ideal for valves, conical stopcocks and shut-off duties in research and routine laboratory environments that specify NS 12,5 geometry and DIN 12541 compliance.
This article is part of Stopcocks & valves, in Tubing, hoses & fittings.
Key features
- Pack size: 1 pc
- Joint size: NS 12,5
- Plug type: NS-PTFE
- Bore diameter: 1,6 mm
- Connection type: Capillary connectors
- Standard: DIN 12541
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Questions about stopcock ST 12
What is this article?
stopcock ST 12 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.