Description
1-Way stopcock with bent tube connectors NS 12,5 is a compact laboratory valve for directed fluid or gas control in glass apparatus. It features an NS 12,5 ground joint, an NS-PTFE plug, and bent-tube connectors, together with an elastic threaded stopcock lock that helps keep the plug securely seated during use. The 1,6 mm bore provides a defined flow path suited to fine dosing, sampling lines, and isolation duties, while construction to DIN 12541 supports standardized interchangeability with matching NS glassware. Bent-tube approaches simplify routing in crowded setups and reduce stress on adjoining joints. Supplied as a single piece with a net weight of 0,032 kg, this stopcock from manufacturer Witeg is appropriate for research, analytical, and teaching laboratories that require reliable one-way shut-off with chemical-resistant PTFE sealing. The combination of PTFE plug, elastic thread lock, and bent connectors promotes durable, leak-conscious performance in everyday chemistry and life-science assemblies where compact geometry and secure plug retention matter.
This article is part of Stopcocks & valves, in Tubing, hoses & fittings.
Key features
- Pack size: 1 pc
- Type: 1-way stopcock
- Joint size: NS 12,5
- Plug: NS-PTFE
- Connectors: Bent tube
- Bore diameter: 1,6 mm
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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.