Description
Straight-through stopcock according to Schiff NS 21,5 is a glass laboratory stopcock intended for precise flow regulation in vacuum lines and general laboratory glassware. It is fitted with a hollow NS glass plug of joint size NS 21,5, plug dimensions 13 × 120 mm and a bore of 6,3 mm. Conforming to DIN 12545, the design delivers an unobstructed straight-through path when open and a secure seal when closed. This stopcock from manufacturer Witeg is appropriate for building or repairing distillation apparatus, gas-handling manifolds and reaction setups that require an NS 21,5 conical ground-joint valve. The hollow plug construction keeps weight low while preserving durability under normal laboratory conditions. Net weight is 0,085 kg. Offered as a single piece, it fits standard ground-joint systems and supports reliable liquid or gas control in analytical and preparative environments.
This article is part of Stopcocks & valves, in Tubing, hoses & fittings.
Key features
- Pack size: 1 pc
- Joint size: NS 21,5
- Plug dimensions: 13 × 120 mm
- Bore: 6,3 mm
- Plug type: hollow NS glass plug
- Standard: DIN 12545
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Questions about Stopcock acc. to Schiff ST 21,5
What is this article?
Stopcock acc. to Schiff ST 21,5 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.