Description
Replacement plug hollow Type N NS 12,5 is a precision ground-glass stopcock plug designed for laboratory glassware assemblies that require a reliable hollow plug without threaded stopcock securing. Manufactured to DIN 12541, it features a standard taper joint size of NS 12,5 and a central bore of 1,6 mm, allowing controlled passage of liquids or gases in vacuum and atmospheric setups. The hollow construction reduces mass while maintaining mechanical stability at the ground joint interface. This spare part from manufacturer Witeg is intended for routine replacement of worn or damaged plugs in stopcocks and similar fittings, helping laboratories maintain leak-tight connections without exchanging the entire stopcock body. Supplied as a single piece with a net weight of 0,007 kg, the component integrates directly into existing NS 12,5 systems used in synthesis, distillation and analytical work. Its Type N geometry supports straightforward insertion and removal during maintenance, making it a practical consumable for glass workshops and research facilities that standardise on DIN-compliant ground joints.
This article is part of Rubber & silicone stoppers, in Stoppers, caps & closures.
Key features
- Pack size: 1 pc
- Type: N hollow
- Joint size: NS 12,5
- Bore diameter: 1,6 mm
- Standard: DIN 12541
- Thread lock: without threaded stopcock securing
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Questions about Stopcock ST 12,5
What is this article?
Stopcock ST 12,5 is the article on this page. Luminix Health distributes Witeg for laboratory use. It sits in Rubber & silicone stoppers, inside Stoppers, caps & closures, in Labware.
A rubber or silicone stopper is pushed into a mouth. The size number corresponds to a top and bottom diameter. Silicone survives higher temperatures and more autoclave cycles. Natural rubber is attacked by oils and by some solvents.
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 Rubber & silicone stoppers. The catalogue is Labware.
Shelves beside this one are Screw caps & closures, Ground-joint glass 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.