Description
2-way stopcock NS 21,5 with NS-PTFE plug is a robust laboratory valve designed for higher-flow fluid control in glass apparatus. It is equipped with an NS-PTFE plug, bent tube connectors and a threaded stopcock lock, conforming to DIN 12553. The bore measures 4 mm and the joint geometry is specified as NS 21 / 10 × 110 mm, providing a generous passage for liquids or gases while maintaining secure conical-joint sealing. Supplied as a single unit with a net weight of 0,084 kg, the stopcock is intended for distillation, vacuum work and general process routing where a larger bore improves throughput. The PTFE plug ensures smooth actuation and resistance to many common laboratory chemicals, and the bent-tube connectors allow neat, space-efficient installation. This component from manufacturer Witeg fits standard NS glassware systems and supports reproducible isolation and metering tasks in research, quality-control and teaching environments. Its combination of defined 4 mm bore, threaded lock and durable construction makes it a dependable choice for demanding two-way valve applications on the laboratory bench.
This article is part of Rubber & silicone stoppers, in Stoppers, caps & closures.
Key features
- Pack size: 1 pc(s)
- Type: 2-way stopcock with bent tube connectors
- Bore: 4 mm
- Joint size: NS 21,5
- Plug material: NS-PTFE
- Standard: DIN 12553
Recently viewed
You may also like
Browse related categories
Category
Sub-category
Catalogue
Brand
Questions about Stopcock, double bore, with ST-PTFE-plug
What is this article?
Stopcock, double bore, with ST-PTFE-plug is the article on this page. Luminix Health distributes Witeg for laboratory use. It sits in Rubber & silicone stoppers, inside Stoppers, caps & closures, in Labware.
A rubber or silicone stopper is pushed into a mouth. The size number corresponds to a top and bottom diameter. Silicone survives higher temperatures and more autoclave cycles. Natural rubber is attacked by oils and by some solvents.
A closure is the part that decides whether a bottle stays shut and whether the contents attack the seal. A ground-glass stopper matches a ground neck. A screw cap needs the right thread and a liner that survives the liquid. Rubber and silicone stoppers push into a mouth. The liner, not the colour of the cap, is the chemical choice. The vessels they close are indexed under ISO laboratory glassware.
Which category should I open next?
The category is Stoppers, caps & closures. The sub-category is Rubber & silicone stoppers. The catalogue is Labware.
Shelves beside this one are Screw caps & closures, Ground-joint glass stoppers, Lids & seals and Closures (other).
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.