Description
3-Way stopcock with PTFE thread NS 18,8 is a precision laboratory valve designed for controlled three-way flow distribution in chemical glassware. It features a T-bore configuration, an NS-PTFE plug and a threaded stopcock lock that keeps the plug firmly seated during use. The component measures 10 x 110 mm with a bore of 4,0 mm and complies with DIN 12554. Net weight is 0,083 kg; the item is supplied as a single piece. This stopcock from manufacturer Witeg mates directly with NS 18,8 ground-joint systems and is suitable for vacuum lines, distillation apparatus, gas manifolds and multi-path reagent routing. The PTFE sealing surface provides chemical resistance for typical laboratory media, while the threaded retention improves handling safety during repeated actuation. Standardised dimensions allow straightforward incorporation into existing setups, supporting reliable performance in research, analytical and educational laboratory environments where inert materials and interchangeable plugs are advantageous.
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 18,8
- Bore diameter: 4,0 mm
- Dimensions: 10 x 110 mm
- Plug: NS-PTFE with threaded stopcock lock
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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. 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.