Description
1-Way stopcock NS 18,8/4 mm PTFE complete is a ready-to-use laboratory glass valve for secure shut-off and flow control in ground-joint apparatus. The unit is supplied fully assembled with an NS-PTFE plug and stopcock retainer, offering a 4 mm bore path that conforms to DIN 12541. Its NS 18,8 joint size matches common laboratory glassware, making it suitable for vacuum lines, reaction setups and general fluid-handling trains. From manufacturer Witeg, this complete one-way stopcock arrives as a single piece with a net weight of 0,072 kg, ready for immediate installation without separate plug sourcing. The PTFE plug provides smooth operation and chemical resistance for repeated use in research and quality-control environments, while the integrated retainer helps keep the plug securely seated during handling and pressure changes. Ideal wherever a durable, DIN-compliant PTFE stopcock with defined NS geometry is needed for reliable isolation and metering of liquids or gases in everyday laboratory practice.
This article is part of Stopcocks & valves, in Tubing, hoses & fittings.
Key features
- Pack size: 1 pc
- Type: 1-way stopcock complete
- Joint size: NS 18,8/4
- Bore: 4 mm
- Plug: NS-PTFE with retainer
- Material: PTFE plug
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Questions about stopcock ST 19 / 4 mm
What is this article?
stopcock ST 19 / 4 mm 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.