Description
Centering ring with Perbunan O-ring, stainless steel, DN 25 KF is a vacuum sealing accessory for DN 25 KF small-flange joints on laboratory vacuum equipment. The stainless-steel ring centres the Perbunan O-ring between paired KF flanges so that a uniform, demountable seal is formed along the vacuum path. Supplied as 1 pc, it serves as a replacement or spare part for pumps, manifolds, receivers and modular vacuum lines built on ISO-KF hardware. DN 25 KF is a common intermediate flange size in benchtop and pilot-scale vacuum setups, and correct centering rings are essential for leak-tight assembly. This centering ring from manufacturer WELCH matches standard DN 25 KF geometry used across many laboratory instruments and accessory kits. The Perbunan O-ring provides the elastomeric sealing face for repeated make-and-break connections during maintenance or reconfiguration. Laboratories maintaining KF vacuum networks can stock this stainless-steel DN 25 centering ring to keep titration-support vacuum, filtration and process lines serviceable without redesigning the flange interface.
This article is part of Hose connectors, adapters & fittings, in Tubing, hoses & fittings.
Key features
- Pack size: 1 pc
- Product type: Centering ring
- Seal: Perbunan O-ring
- Ring material: Stainless steel
- Flange size: DN 25 KF
- Connection standard: KF (small flange)
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Questions about Centering Ring with Perbunan O-Ring, Stainless Steel, DN 25 KF
What is this article?
Centering Ring with Perbunan O-Ring, Stainless Steel, DN 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?
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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.