Description
External centering ring with Perbunan O-ring, aluminium, DN 40 KF is a vacuum fitting accessory for aligning and sealing standard KF small-flange connections. The aluminium ring carries an integrated Perbunan O-ring and is sized for DN 40 KF flanges, helping keep mating flanges concentric while the elastomer provides the sealing interface in laboratory vacuum lines. It is supplied as a single piece for straightforward replacement or assembly work on pumps, manifolds, traps and instrumentation. In everyday lab practice this external centering ring supports reliable KF joints where aluminium hardware and a Perbunan seal are specified. The component fits the established KF geometry used across analytical and research vacuum setups and belongs to the category of accessories and spare parts for laboratory equipment. Offered by manufacturer WELCH, it is intended for technicians and lab managers who need a DN 40 KF external centering ring with Perbunan O-ring for routine maintenance or new vacuum assemblies without changing the flange standard already in use.
This article is part of Hose connectors, adapters & fittings, in Tubing, hoses & fittings.
Key features
- Pack size: 1 pc
- Product type: External centering ring
- Material: Aluminium
- Seal: Perbunan O-ring
- Flange size: DN 40 KF
- Connection standard: KF small flange
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Questions about External Centering Ring with Perbunan O-Ring, Aluminium, DN 40 KF
What is this article?
External Centering Ring with Perbunan O-Ring, Aluminium, 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?
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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.