Description
Reducer DN 40/25 KF is a stainless steel vacuum flange component that joins two different KF (Klein Flange) nominal sizes in laboratory and analytical vacuum installations. The fitting converts a DN 40 KF connection to a DN 25 KF connection, allowing pumps, gauges, traps, and process chambers of mismatched flange sizes to be linked in one sealed line. Stainless steel construction provides mechanical strength and resistance under typical laboratory vacuum conditions and supports repeated assembly with standard KF clamps and centering rings. Typical uses include rotary-evaporator vacuum trains, mass-spectrometry inlet lines, freeze dryers, glove-box feedthroughs, and general bench-scale vacuum manifolds where a compact step between DN 40 and DN 25 is required. Offered as a single piece from manufacturer WELCH, the reducer is intended as a durable accessory or spare part for laboratory equipment. Its KF geometry follows established flange conventions, so it mates directly with existing DN 40 and DN 25 hardware without special adapters. This DN 40/25 KF stainless steel reducer is a practical choice for modular vacuum system design, maintenance, and reconfiguration in research and quality-control laboratories.
This article is part of Hose connectors, adapters & fittings, in Tubing, hoses & fittings.
Key features
- Pack size: 1 pc
- Product type: KF vacuum reducer
- Material: Stainless steel
- Flange sizes: DN 40/25 KF
- Connection standard: Klein Flange (KF)
Recently viewed
You may also like
Questions about Reducer, Stainless Steel, DN 40/25 KF
What is this article?
Reducer, Stainless Steel, 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.
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.