Description
2-way stopcock with bent tube connectors NS 21 and 4 mm bore is a precision glass laboratory valve designed for controlled fluid handling in analytical and preparative setups. It features a hollow NS plug together with threaded stopcock securing, giving reliable sealing and smooth actuation under repeated laboratory use. The bent tube connectors measure 10 × 110 mm, enabling convenient integration into glass apparatus and manifold systems. Supplied as a single piece from manufacturer Witeg, the compact unit has a net weight of 0,092 kg and supports chemistry, biochemistry and general laboratory workflows that demand two-way flow control. The NS 21 ground-joint interface ensures a secure fit to matching conical joints, while the relatively large 4 mm bore allows efficient transfer and metering of liquids and gases. Typical applications include vacuum lines, distillation assemblies and reaction apparatus where dependable shut-off performance and higher throughput are required.
This article is part of Stopcocks & valves, in Tubing, hoses & fittings.
Key features
- Pack size: 1 pc
- Type: 2-way stopcock
- Joint size: NS 21
- Bore diameter: 4 mm
- Tube dimensions: 10 × 110 mm
- Plug type: Hollow NS plug with threaded securing
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Questions about Stopcock, double bore, bore: 4 mm
What is this article?
Stopcock, double bore, bore: 4 mm 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.