Description
The 3-way stopcock with hollow plug NS 21,5 is a laboratory glass valve engineered for precise three-path fluid control in chemical and analytical glassware. Equipped with a T-bore of 4 mm diameter, a hollow plug and bent tube connections, it conforms to DIN 12554 and mates with standard NS 21,5 ground joints. This design enables clear selection or isolation of flow routes in manifolds, diversion lines and multi-port reaction or distillation assemblies. The larger bore relative to smaller NS variants supports higher throughput while retaining the leak-resistant seal expected from precision ground-joint stopcocks. Offered as one piece with a net weight of 0,086 kg from manufacturer Witeg, the component is intended for routine vacuum and atmospheric work in research, quality-control and teaching laboratories. Bent tube ends ease coupling to flexible tubing or further glass parts, and the hollow-plug construction keeps the valve compact within crowded apparatus frames. Use it wherever a standardised NS 21,5 three-way stopcock is needed for reproducible routing of liquids or gases.
This article is part of Ground-joint glass stoppers, in Stoppers, caps & closures.
Key features
- Pack size: 1 pc
- Type: 3-way stopcock with hollow plug
- Joint size: NS 21,5
- Bore diameter: 4 mm
- Bore configuration: T-bore
- Standard: DIN 12554
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Questions about Stopcock, three-way, hollow plug,ST 21,5
What is this article?
Stopcock, three-way, hollow plug,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.