Description
Reducing stopper KNS 19/26 → HNS 14/23 is a short glass transition piece in stopper form that converts a larger ground joint to a smaller one. It features a cone NS 19/26 and a socket NS 14/23, manufactured in accordance with DIN 12257 for standardised laboratory glassware connections. The compact stopper-style design allows quick reduction of joint size while maintaining a secure, leak-resistant fit in distillation, reaction and vacuum assemblies. Supplied as a single piece with a net weight of 0,011 kg from manufacturer Witeg, the adapter is intended for everyday use in organic synthesis, sample preparation and general laboratory set-ups. Its short overall length helps keep apparatus compact and reduces dead volume. The reducing stopper belongs to the family of ground-joint transition pieces and supports modular glass systems where NS 19/26 equipment must be coupled to NS 14/23 components without additional intermediate fittings.
This article is part of Ground-joint glass stoppers, in Stoppers, caps & closures.
Key features
- Pack size: 1 pc(s)
- Type: Reducing stopper / short transition piece
- Cone joint: NS 19/26
- Socket joint: NS 14/23
- Standard: DIN 12257
- Form: Stopper-style short adapter
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Questions about Short adapter CST 19/26 -> SST 14/23
What is this article?
Short adapter CST 19/26 -> SST 14/23 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.