Description
3-Way stopcock with PTFE plug and capillary joints NS 18,8 is a robust laboratory valve intended for directing fluid streams in larger ground-joint assemblies. The unit provides a T-bore layout, nominal size NS 18,8, an NS-PTFE plug, capillary joint ends and a threaded stopcock lock. Capillary arms measure 9 × 100 mm with a bore of 2,5 mm and manufacture complies with DIN 12554. Offered as a single piece weighing 0,085 kg net, this stopcock from manufacturer Witeg suits preparative and process-oriented glassware where higher flow capacity is advantageous. PTFE sealing surfaces deliver chemical inertness and smooth rotation, while the larger bore supports efficient transfer of liquids or gases. Capillary connections enable secure coupling to tubing or secondary apparatus in synthesis, distillation and separation workflows. The threaded lock maintains plug position during repeated three-way switching, helping ensure leak-tight, reproducible operation. The stopcock is designed for routine laboratory service wherever standardised NS 18,8 joints and inert PTFE contact materials are specified.
This article is part of Stopcocks & valves, in Tubing, hoses & fittings.
Key features
- Pack size: 1 pc
- Design: 3-way stopcock, T-bore
- Joint size: NS 18,8
- Plug: NS-PTFE with threaded lock
- Capillary arms: 9 × 100 mm
- Bore diameter: 2,5 mm
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Questions about Stopcock, three-way ST 18,8
What is this article?
Stopcock, three-way ST 18,8 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. 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.