Description
Reducer, stainless steel, DN 40/16 KF is a vacuum flange adapter that reduces a KF connection from DN 40 to DN 16. Fabricated in stainless steel, it serves as laboratory equipment accessory hardware for KF vacuum lines, manifolds and instrument ports where a clear step between these two nominal diameters is required. The single-piece reducer mates directly to matching KF flanges, enabling compact assembly of vacuum apparatus, pumps and process modules built on the KF clamp system. The DN 40/16 marking identifies the large and small flange ends so the fitting can be oriented correctly during installation. This stainless steel KF reducer from manufacturer WELCH is offered as one piece for laboratories and technical facilities that rely on KF hardware and need a robust metal transition from DN 40 to DN 16. It forms part of the accessory and spare-parts offering for laboratory devices and is chosen when a durable, corrosion-resistant size reduction is needed in KF vacuum configurations without intermediate adapters.
This article is part of Hose connectors, adapters & fittings, in Tubing, hoses & fittings.
Key features
- Pack size: 1 pc
- Product type: KF flange reducer
- Material: Stainless steel
- Flange standard: KF
- Large end: DN 40
- Small end: DN 16
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Questions about Reducer, Stainless Steel, DN 40/16 KF
What is this article?
Reducer, Stainless Steel, DN 40/16 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.
How does ordering and shipping work?
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.

