Description
Centering ring with Viton O-ring, stainless steel, DN 25 KF is a vacuum flange accessory for ISO-KF style laboratory and technical vacuum connections. The component pairs a stainless steel centering ring with a Viton elastomer O-ring so that DN 25 KF flange faces can be aligned and sealed in a defined geometry. In everyday vacuum practice this format is used on pump lines, manifolds, traps and instrument interfaces wherever the nominal KF size DN 25 is specified. The metal ring provides mechanical centering of the joint, while the Viton O-ring acts as the compressible sealing element between the flange faces. Offered as 1 pc, the part supports routine maintenance, spare-parts stocking and like-for-like replacement on existing KF hardware. Clear DN 25 KF designation helps match drawings, catalogues and installed systems without ambiguity. This centering ring with Viton O-ring from manufacturer WELCH belongs to the accessories and spare parts range for laboratory equipment and is intended for users who need a stainless steel KF centering solution with a Viton seal in the DN 25 size. It integrates into standard clamp-style KF assemblies and keeps the sealing interface consistent across modular vacuum setups in research and analytical environments.
This article is part of Hose connectors, adapters & fittings, in Tubing, hoses & fittings.
Key features
- Pack size: 1 pc
- Product type: Centering ring with Viton O-ring
- Material: Stainless steel
- Seal: Viton O-ring
- Nominal size: DN 25 KF
- Connection standard: KF (ISO-KF)
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Questions about Centering Ring with Viton O-Ring, Stainless Steel, DN 25 KF
What is this article?
Centering Ring with Viton O-Ring, Stainless Steel, 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?
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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.