Description
Safety tube NS 19/26 is a laboratory glassware component functioning as a fermentation attachment with a precision standard ground joint of NS 19/26. This safety tube enables controlled gas exchange and pressure equalisation in closed reaction or culture systems while minimising contamination risk. It integrates directly into conical ground-joint assemblies used throughout organic synthesis, distillation and microbiological work. The compact design weighs only 0,062 kg net, making it easy to handle yet robust enough for repeated laboratory use. Produced by manufacturer Witeg, the tube conforms to established Normschliff dimensions and is intended for seamless pairing with matching flasks, condensers and adapters. In fermentation setups the attachment acts as a classic Gäraufsatz, allowing visual monitoring of gas evolution when partially filled with liquid. Single-piece supply supports both routine teaching laboratories and research environments that require reliable, interchangeable glass connections. Originating from Germany (Baden-Württemberg), the component reflects consistent European manufacturing quality for standard joint glassware. Its straightforward geometry ensures quick assembly and disassembly without specialised tools, facilitating efficient workflow in multi-step experimental protocols.
This article is part of Distillation heads, adapters & columns, in Distillation & extraction glassware.
Key features
- Pack size: 1 pc
- Product type: Safety tube (fermentation attachment)
- Joint size: NS 19/26
- Country of origin: Germany
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Distillation & extraction glassware
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Distillation heads, adapters & columns
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Questions about Safety tube (Thistle funnels), ST 19/26
What is this article?
Safety tube (Thistle funnels), ST 19/26 is the article on this page. Luminix Health distributes Witeg for laboratory use. It sits in Distillation heads, adapters & columns, inside Distillation & extraction glassware, in Labware.
A still head, an adapter or a column is the glass between the boiling flask and the condenser. A Vigreux or packed column gives the vapour a surface so a closer-boiling mixture can separate. The joint sizes at both ends have to match the flask and the condenser.
Distillation separates liquids by boiling point. A condenser turns the vapour back into liquid: Liebig, coil and cold-finger shapes differ in how much cooling surface they offer. A still head and a column sit between the flask and the condenser. A Soxhlet extractor washes a solid again and again with the same solvent. Ground joints have a standard size, and the joint, not the flask, is what has to match. The pieces are indexed under ISO laboratory glassware.
Which category should I open next?
The category is Distillation & extraction glassware. The sub-category is Distillation heads, adapters & columns. The catalogue is Labware.
Shelves beside this one are Condensers, Ground-joint glassware (other) and Soxhlet & extraction apparatus.
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. Delivery across Europe, two to five days when in stock. 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.
