Description
Reducing tee, stainless steel, DN 40/25 KF is a laboratory vacuum fitting that connects KF flange lines of different nominal diameters in a tee configuration. The DN 40/25 geometry steps the main path between the larger and smaller KF sizes while providing a branch port for additional vacuum routing. Stainless steel construction gives the component the mechanical strength and corrosion resistance expected in routine laboratory vacuum assemblies used with pumps, manifolds and process apparatus. Offered as a single piece, the fitting is intended for integration, extension or replacement within existing KF vacuum networks. This reducing tee from manufacturer WELCH belongs to the accessories and spare-parts range for laboratory equipment and supports compact layout of mixed-diameter KF connections. Clear DN 40 and DN 25 KF interfaces help match flange standards across instruments and tubing runs without improvised adapters. Laboratories can stock the unit as a dedicated connection element for maintenance or new vacuum-line builds where a reducing tee is required. The product is supplied as one piece for straightforward ordering and installation in research and analytical environments.
This article is part of Hose connectors, adapters & fittings, in Tubing, hoses & fittings.
Key features
- Pack size: 1 pc
- Product type: Reducing tee
- Material: Stainless steel
- Connection: DN 40/25 KF
- Flange system: KF
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Questions about Reducing Tee, Stainless Steel, DN 40/25 KF
What is this article?
Reducing Tee, 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.

