Description
3-Way stopcock with solid NS plug NS 21,5 is a precision laboratory glass valve designed for controlled multi-path fluid routing in chemical and analytical work. It features a T-bore configuration, a solid ground NS plug in size NS 21,5 and a bent tube connection, allowing secure integration into standard interchangeable joint assemblies. The bore diameter is 4 mm, supporting reliable flow of liquids and gases under typical laboratory conditions. An over-rotation-proof threaded stopcock lock secures the plug against unintended movement and helps maintain a consistent seal during repeated open–close cycles. Overall dimensions are 10 × 110 mm, giving a compact footprint suitable for bench setups and apparatus trains. Built to DIN 12554, this stopcock from manufacturer Witeg is intended for synthesis lines, sample distribution, solvent handling and general shut-off or diversion tasks wherever three-way switching with NS joints is required. Supplied as a single piece with a net weight of 0,1 kg, it fits categories such as cone valves, stopcocks and laboratory shut-off valves used in research, teaching and quality-control environments that rely on durable, standardised glass components.
This article is part of Ground-joint glass stoppers, in Stoppers, caps & closures.
Key features
- Pack size: 1 pc
- Design: 3-way stopcock with T-bore
- Joint size: NS 21,5
- Plug type: Solid NS plug with bent tube connection
- Bore diameter: 4 mm
- Dimensions: 10 x 110 mm
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Questions about Stopcock, three way, ST 21,5
What is this article?
Stopcock, three way, ST 21,5 is the article on this page. Luminix Health distributes Witeg for laboratory use. It sits in Ground-joint glass stoppers, inside Stoppers, caps & closures, in Labware.
A ground-glass stopper matches a ground neck of a stated joint size. A 14/23 stopper does not seal a 29/32 neck. The stopper is part of the flask's seal, and a chip on the grind is a leak.
A closure is the part that decides whether a bottle stays shut and whether the contents attack the seal. A ground-glass stopper matches a ground neck. A screw cap needs the right thread and a liner that survives the liquid. Rubber and silicone stoppers push into a mouth. The liner, not the colour of the cap, is the chemical choice. The vessels they close are indexed under ISO laboratory glassware.
Which category should I open next?
The category is Stoppers, caps & closures. The sub-category is Ground-joint glass stoppers. The catalogue is Labware.
Shelves beside this one are Screw caps & closures, Rubber & silicone stoppers, Lids & seals and Closures (other).
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.