Description
3-Way stopcock with PTFE thread NS 21,5 is a laboratory valve engineered for multi-directional flow control in glass apparatus. It incorporates a T-bore together with an NS-PTFE plug and threaded stopcock lock that secures the plug during operation. Bent-tube side arms measure 10 x 110 mm and the bore diameter is 4 mm, conforming to DIN 12554. The unit has a net weight of 0,11 kg and is supplied as a single piece. Manufactured by Witeg, this stopcock is intended for use with matching NS 21,5 ground joints in vacuum manifolds, distillation trains, gas-handling lines and general laboratory fluid routing. The PTFE plug offers chemical inertness toward many common reagents, while the threaded retention mechanism reduces the risk of unintended plug displacement. Its standardised dimensions support direct integration into existing glassware systems without additional adapters, making it a practical choice for research, teaching and quality-control laboratories that require reliable three-way switching.
This article is part of Stopcocks & valves, in Tubing, hoses & fittings.
Key features
- Pack size: 1 pc
- Type: 3-way stopcock, T-bore
- Joint size: NS 21,5
- Bore diameter: 4 mm
- Dimensions: 10 x 110 mm
- Plug: NS-PTFE with threaded stopcock lock
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Questions about Stopcock, three-way, ST 21,5
What is this article?
Stopcock, three-way, ST 21,5 is the article on this page. Luminix Health distributes Witeg 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. 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.