Description
Replacement plug NS 18,8 PTFE is a laboratory stopcock spare designed for standard ground-joint glassware requiring a larger bore. Fabricated from chemically resistant PTFE, the plug matches NS 18,8 joints and features a 6,3 mm bore for higher flow capacity in stopcocks and valve assemblies. PTFE offers excellent inertness toward aggressive reagents and solvents, low friction for smooth rotation, and a durable sealing surface that helps maintain leak-tight performance during everyday laboratory use. Supplied as one piece with a net weight of 0,03 kg, this replacement Küken enables quick servicing of worn or damaged plugs without discarding the entire stopcock body. It is particularly useful in synthesis, distillation and general fluid-transfer work where reliable, contamination-free shut-off is essential. The part comes from manufacturer Witeg and fits the established range of PTFE Hahnküken used in analytical and preparative laboratories. Keeping this NS 18,8 PTFE plug on hand supports efficient maintenance of glass apparatus and reduces downtime when original plugs need replacement.
This article is part of Ground-joint glass stoppers, in Stoppers, caps & closures.
Key features
- Pack size: 1 pc
- Material: PTFE
- Joint size: NS 18,8
- Bore diameter: 6,3 mm
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Questions about ST-seperate plug ST 18,,8
What is this article?
ST-seperate plug ST 18,,8 is the article on this page. Luminix Health distributes Witeg for laboratory use. It sits in Ground-joint glass stoppers, inside Stoppers, caps & closures, in Labware.
A ground-glass stopper matches a ground neck of a stated joint size. A 14/23 stopper does not seal a 29/32 neck. The stopper is part of the flask's seal, and a chip on the grind is a leak.
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 Ground-joint glass stoppers. The catalogue is Labware.
Shelves beside this one are Screw caps & closures, Rubber & silicone 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.