Description
Bag cock according to Schiff, NS 18,8 is a laboratory glass stopcock intended for controlled fluid and gas handling in scientific glassware. It is fitted with a hollow NS glass plug, ground joint size NS 18,8 and a bore of 4 mm. The component measures 10 × 110 mm and is produced for reliable fit in conical-joint assemblies. This Schiff-type bag cock is applied in vacuum lines, gas-transfer setups and custom apparatus where a robust shut-off valve with standard joint compatibility is essential. Available as a single piece from manufacturer Witeg, it has a net weight of 0,053 kg and connects readily to matching laboratory glassware. The hollow plug geometry allows smooth operation and secure sealing under normal laboratory conditions. It is suitable for organic synthesis, distillation systems and analytical workflows that demand precise flow regulation. The NS 18,8 interface supports interchangeability with corresponding ground-joint components in research and industrial laboratories.
This article is part of Stopcocks & valves, in Tubing, hoses & fittings.
Key features
- Pack size: 1 pc
- Joint size: NS 18,8
- Bore: 4 mm
- Dimensions: 10 × 110 mm
- Plug type: Hollow NS glass plug
Recently viewed
You may also like
Browse related categories
Category
Sub-category
Catalogue
Brand
Questions about Bag-stopcock, Schiff, ST 18,8
What is this article?
Bag-stopcock, Schiff, 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. 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.