Description
3-way stopcock NS 19 with capillary joints 2,5 mm provides dependable multi-path flow control for laboratory glass systems. Equipped with a T-bore and solid NS plug at joint size NS 18,8, it allows precise redirection of liquids or gases between three ports. The capillary side arms are dimensioned 9 × 100 mm with a 2,5 mm bore, offering higher throughput than finer capillary variants while retaining compact geometry. Built to DIN 12554 and fitted with an oversized thread for stable plug retention, the stopcock ensures consistent sealing under routine laboratory conditions. Delivered as one piece with a net weight of 0,098 kg from manufacturer Witeg, it integrates readily into vacuum manifolds, reaction trains and sampling lines. Standardised NS dimensions support interchangeability with existing glassware, making the valve a practical choice for synthetic chemistry, analytical sample handling and process-scale laboratory work where robust three-way switching is essential.
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: 2,5 mm
- Capillary joints: 9 × 100 mm
- Plug: solid NS plug
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Questions about Stopcock, three way, ST 19
What is this article?
Stopcock, three way, ST 19 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.