Description
Flexible coupling DN 40 KF, 90 mm is a vacuum line element for laboratory and technical systems based on the Klein flange (KF) standard. With nominal diameter DN 40 and a length of 90 mm, it connects larger KF ports on pumps, manifolds, traps and process chambers while accommodating small angular and lateral offsets. The flexible construction helps damp vibration and alignment differences, limiting stress on glassware, instrumentation and sealed interfaces during evacuation, operation and maintenance. Provided as one piece, the coupling fits modular KF vacuum plumbing used in analytical laboratories, research installations and pilot process lines. This accessory from manufacturer WELCH supports rapid make-and-break of DN 40 KF connections without permanent modification of the piping. It is intended as laboratory equipment accessory or spare part where clean, repeatable vacuum joints and tidy routing matter. The compact 90 mm length keeps assemblies short yet flexible enough for practical hose runs between fixed flanges. Apply it wherever DN 40 KF interfaces must stay vacuum-tight under routine laboratory use and reconfiguration of the vacuum path.
This article is part of Hose connectors, adapters & fittings, in Tubing, hoses & fittings.
Key features
- Pack size: 1 pc
- Product type: Flexible coupling
- Nominal diameter: DN 40 KF
- Length: 90 mm
- Flange standard: KF (Klein flange)
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Questions about Flexible Coupling, DN 40 KF, 90mm
What is this article?
Flexible Coupling, DN 40 KF, 90mm 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.