Description
Disposable stopcock with PTFE plug NS 18,8/4,0 mm bore is a single-use laboratory valve intended for reliable flow control of liquids and gases in chemical synthesis, sample preparation and analytical setups. Constructed from borosilicate glass 3.3, it incorporates a PTFE plug, bent tube connections and a plug security feature that keeps the stopcock key securely seated during operation. The larger NS 18,8 ground joint and 4,0 mm bore deliver a standardised taper connection with increased flow capacity compared with smaller stopcocks, making the unit suitable for vacuum apparatus, inert-gas lines, distillation trains and general laboratory glassware. Borosilicate glass 3.3 provides the chemical resistance and thermal stability expected in routine laboratory service. Supplied as one piece with a net weight of 0,070 kg, this stopcock from manufacturer Rettberg supports contamination-sensitive workflows by allowing disposal after use while remaining compatible with common NS joint systems. It is well suited to research, quality-control and process laboratories that need clean, inert and easily replaceable flow-control components.
This article is part of Ground-joint glass stoppers, in Stoppers, caps & closures.
Key features
- Pack size: 1 pc
- Material: Borosilicate glass 3.3
- Plug material: PTFE
- Joint size: NS 18,8
- Bore diameter: 4,0 mm
- Design: Bent tube connections with plug security
- Technical Information Sheet:
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Questions about Stopcock, straight bore, PTFE-plug size 18,8/4,0 mm bore
What is this article?
Stopcock, straight bore, PTFE-plug size 18,8/4,0 mm bore is the article on this page. Luminix Health distributes Rettberg 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.