Description
Centering ring with Viton O-ring, aluminium, DN 25 KF is a KF vacuum flange component combining an aluminium centering ring with an integrated Viton elastomer O-ring. It is designated for DN 25 KF (Klein Flange) connections commonly found on laboratory vacuum pumps, manifolds, traps, and interconnecting hardware. In use, the ring supports flange alignment so the O-ring can sit correctly between the mating faces when the joint is closed with a compatible clamp. The aluminium body defines the centering geometry, and the Viton O-ring supplies the sealing elastomer named in the product title. The unit is supplied as 1 piece, suited to replacement, service, or extension of existing KF assemblies. This DN 25 KF version from manufacturer WELCH belongs to laboratory equipment accessories and spare parts and should be matched to the nominal flange size already installed on the system. Correct DN selection helps preserve consistent seal placement and mechanical fit across KF vacuum connections in the laboratory.
This article is part of Hose connectors, adapters & fittings, in Tubing, hoses & fittings.
Key features
- Pack size: 1 pc
- Product type: Centering ring with O-ring
- Material: Aluminium
- Seal: Viton O-ring
- Flange size: DN 25 KF
- Connection standard: KF (Klein Flange)
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Questions about Centering Ring with Viton O-Ring, Aluminium, DN 25 KF
What is this article?
Centering Ring with Viton O-Ring, Aluminium, DN 25 KF is the article on this page. Luminix Health distributes WELCH for laboratory use. It sits in Hose connectors, adapters & fittings, inside Tubing, hoses & fittings, in Labware.
A hose connector or adapter joins two lines, or steps one bore down to another. The barb diameter has to match the tube, and the thread has to match the stopcock or the bottle. Most leaks are a mismatch here, not a hole in the tube.
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 Hose connectors, adapters & fittings. The catalogue is Labware.
Shelves beside this one are PVC, PTFE & other tubing, Stopcocks & valves, 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.
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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.