Description
Centering ring with fine filter and Perbunan O-ring, stainless steel, DN 40 KF is a vacuum flange accessory for laboratory equipment. It combines a stainless steel centering ring with an integrated fine filter and a Perbunan elastomer O-ring, matched to DN 40 KF connections. This arrangement supports correct flange alignment and sealing while the fine filter helps retain particles in the vacuum path. Supplied as one piece, the component is suited to installation, service, or replacement on KF vacuum lines and related apparatus. The stainless steel body provides mechanical stability at the joint, and the Perbunan O-ring forms the sealing element between the flanges. From manufacturer WELCH, the part belongs to accessories and spare parts for laboratory instruments. Typical use includes vacuum pump connections, manifolds, and other laboratory vacuum assemblies where a filtered DN 40 KF centering ring is required. By uniting centering, filtration, and sealing in a single ring, it offers a practical option for maintaining KF flange integrity in research and analytical laboratory setups.
This article is part of Hose connectors, adapters & fittings, in Tubing, hoses & fittings.
Key features
- Pack size: 1 pc
- Product type: Centering ring with fine filter
- Material: Stainless steel
- Seal: Perbunan O-ring
- Flange size: DN 40 KF
- Filter: Integrated fine filter
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Questions about Centering Ring with Fine Filter and Perbunan O-Ring, Stainless Steel, DN 40 KF
What is this article?
Centering Ring with Fine Filter and Perbunan O-Ring, Stainless Steel, DN 40 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.