Description
High-vacuum stopcock, one-way form with hollow glass key NS 21,5/6,0 mm bore is a precision laboratory valve intended for high-vacuum service. Produced from borosilicate glass 3.3, the unit incorporates a hollow glass key and is arranged in one-way form with parallel limbs. The NS 21,5 ground joint combined with a 6,0 mm bore permits controlled passage of gases or vapours while preserving vacuum tightness in assembled glassware. Delivered as 1 pc and weighing 0,105 kg net, the stopcock fits distillation trains, vacuum lines and manifold systems commonly used in research laboratories. Borosilicate glass 3.3 supplies the thermal and chemical durability required for routine laboratory handling. Available from manufacturer Rettberg, the design emphasises dependable sealing under reduced pressure. Parallel side arms ease connection to adjacent tubing or glass components, offering a practical solution for one-way flow regulation. Precise joint and bore dimensions support reproducible performance in a variety of vacuum-based experimental setups.
This article is part of Stopcocks & valves, in Tubing, hoses & fittings.
Key features
- Pack size: 1 pc
- Design: One-way form with parallel limbs
- Key type: Hollow glass key
- Joint size: NS 21,5
- Bore diameter: 6,0 mm
- Material: Borosilicate glass 3.3
- Technical Information Sheet:
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Questions about High vacuum stopcock, hollow glass plug glass plug size 21,5/6,0 mm bore, stra
What is this article?
High vacuum stopcock, hollow glass plug glass plug size 21,5/6,0 mm bore, stra is the article on this page. Luminix Health distributes Rettberg for laboratory use. It sits in Stopcocks & valves, inside Tubing, hoses & fittings, in Labware.
A stopcock opens and closes a line, or directs it between ports. Glass stopcocks have a ground plug that needs grease or a PTFE key. The bore decides the flow. A two-way and a three-way key are different parts.
Tubing is how a liquid or a gas moves between two vessels without being poured. Silicone stays flexible and survives repeated autoclaving. PTFE resists almost every solvent and is stiff. PVC is the ordinary flexible line for water and for mild aqueous work. The fitting, not the tube, is what usually leaks: the barb, the thread and the stopcock have to match the tube bore. Glass and plastic apparatus around these lines is indexed under ISO laboratory ware.
Which category should I open next?
The category is Tubing, hoses & fittings. The sub-category is Stopcocks & valves. The catalogue is Labware.
Shelves beside this one are Hose connectors, adapters & fittings, PVC, PTFE & other tubing, Silicone tubing and Tubing accessories.
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.