Description
DURAN® stopcock plug with groove, ground finish, 6 mm bore and NS 21,5 joint is a solid glass laboratory component engineered for secure stopcock assemblies. The circumferential groove accepts an O-ring that locks the plug in place and prevents it from dropping out of the stopcock barrel during use. Featuring a precise 1:10 taper and fully ground sealing surfaces, the plug ensures reliable seating and leak-tight performance when paired with matching glassware. Manufactured from borosilicate glass 3.3, it combines chemical resistance with thermal stability for everyday laboratory work. This single-piece unit from manufacturer Duran/DWK Life Sciences is intended for replacement or original equipment use in stopcocks handling liquids or gases. The massive solid-glass construction provides mechanical robustness while the ground finish supports smooth rotation and consistent sealing after proper lubrication. Ideal for distillation, titration, vacuum lines and general chemical apparatus where DURAN® quality glass components are specified. Net weight is 0,041 kg.
This article is part of Rubber & silicone stoppers, in Stoppers, caps & closures.
Key features
- Pack size: 1 pc
- Storage temperature: Standard
- Bore diameter: 6 mm
- Joint size: NS 21,5
- Material: Borosilicate glass 3.3
- EAN: 4032051043862
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Questions about DURAN® Stopcock Key threaded, ground
What is this article?
DURAN® Stopcock Key threaded, ground is the article on this page. Luminix Health distributes DWK Life Sciences 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.