Description
The 3-way stopcock with hollow plug NS 18,8 is a precision laboratory glass valve for controlled routing and shut-off of liquids or gases in chemical apparatus. It features a T-bore with a 2,5 mm bore diameter, a hollow plug and bent tube connections, and is manufactured to DIN 12554 for reliable dimensional fit with standard ground-joint systems. This configuration allows three flow paths to be selected or isolated cleanly, supporting manifold work, diversion lines and multi-port glass assemblies in research and analytical laboratories. The NS 18,8 joint size integrates directly into common laboratory glassware setups where a compact three-way valve is required. Supplied as a single piece with a net weight of 0,043 kg from manufacturer Witeg, the stopcock is suited to everyday vacuum and atmospheric applications in synthesis, distillation and sample-handling lines. Its hollow-plug design and bent tube ends simplify connection to tubing or further glass components while maintaining a stable seal at the ground joint. Ideal for building custom flow paths, the valve combines standardised geometry with practical laboratory handling for reproducible fluid control.
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 18,8
- Bore diameter: 2,5 mm
- Bore configuration: T-bore
- Standard: DIN 12554
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Questions about Stopcock, three-way, hollow plug,ST 18,8
What is this article?
Stopcock, three-way, hollow plug,ST 18,8 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.