Description
3-Way stopcock with solid NS plug NS 18,8 is a compact laboratory glass valve for multi-path fluid control in chemical, analytical and preparative setups. The unit combines a T-bore channel layout with a solid ground NS plug in size NS 18,8, enabling clear routing between connected lines while remaining compatible with standard interchangeable joint glassware. Bore diameter is 4,0 mm, providing practical flow capacity for common laboratory liquids and gases. An over-rotation-proof threaded stopcock lock keeps the plug securely positioned and supports repeatable sealing during frequent operation. Body dimensions are 10 × 110 mm, so the stopcock remains easy to mount in crowded apparatus or teaching benches. Manufactured to DIN 12554 by Witeg, the component is suited to synthesis manifolds, solvent transfer, sample diversion and general shut-off duties that call for three-way switching with NS joints. It is supplied as one piece with a net weight of 0,093 kg and addresses typical needs in research laboratories, quality-control labs and educational facilities that specify durable cone stopcocks and valve hardware built to recognised German laboratory glassware standards.
This article is part of Stopcocks & valves, in Tubing, hoses & fittings.
Key features
- Pack size: 1 pc
- Design: 3-way stopcock with T-bore
- Joint size: NS 18,8
- Plug type: Solid NS plug
- Bore diameter: 4,0 mm
- Dimensions: 10 x 110 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.