Description
Straight-through stopcock with solid glass plug NS 18,8/4 mm and threaded GL 14 connections is a precision laboratory valve for reliable flow control in chemical and analytical glassware systems. Fabricated from borosilicate glass 3.3, the component delivers strong chemical resistance together with good thermal stability for everyday laboratory duty. The solid glass plug provides a dependable seal and smooth rotation, while the GL 14 threads allow secure coupling to tubing or apparatus. Suitable for vacuum lines, distillation set-ups and general fluid handling, the stopcock integrates readily into existing assemblies. Offered as a single unit with a net weight of 0,068 kg, it is produced by manufacturer Rettberg and carries the Rettberg® mark. Its compact form and robust construction support repeated use in research, quality-control and teaching laboratories that require precise shut-off performance without metal contamination. The borosilicate glass 3.3 body maintains dimensional integrity across typical laboratory temperature ranges, making the valve a practical choice for both routine and specialised applications.
This article is part of Rubber & silicone stoppers, in Stoppers, caps & closures.
Key features
- Pack size: 1 pc
- Product type: Straight-through stopcock
- Material: Borosilicate glass 3.3
- Plug: Solid glass plug NS 18,8/4 mm
- Connections: Thread GL 14
- Technical Information Sheet:
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Questions about Stopcock, solid glass plug size 18,8/4 mm, connectors thread GL 14
What is this article?
Stopcock, solid glass plug size 18,8/4 mm, connectors thread GL 14 is the article on this page. Luminix Health distributes Rettberg 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.