Description
Reducer, aluminium, DN 40/25 KF is a vacuum flange adapter that connects KF components of unequal nominal diameter in laboratory vacuum setups. The aluminium body links a DN 40 KF interface to a DN 25 KF interface, enabling a compact step between common small-flange sizes used on pumps, manifolds and apparatus. Offered as a single piece, the reducer supports system building, reconfiguration and replacement within vacuum lines that follow the KF standard. It belongs to the accessories and spare parts range for laboratory equipment and is available from manufacturer WELCH for routine workshop and research use. Aluminium construction keeps the part lightweight while remaining suitable for typical laboratory vacuum service. The DN 40/25 KF geometry is intended for integration with matching centring rings, O-rings and clamps already used on KF assemblies. Laboratories that maintain mixed flange sizes can stock this reducer as a dedicated transition piece rather than redesigning entire line segments. Clear nominal marking of the 40/25 step helps correct orientation during assembly. The unit quantity of one piece simplifies ordering for maintenance kits and instrument spares.
This article is part of Hose connectors, adapters & fittings, in Tubing, hoses & fittings.
Key features
- Pack size: 1 pc
- Product type: Reducer
- Material: Aluminium
- Flange size: DN 40/25 KF
- Connection standard: KF
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Questions about Reducer, Aluminium, DN 40/25 KF
What is this article?
Reducer, Aluminium, DN 40/25 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.