Description
Rubber sleeve with turned-over rim provides a flexible sealing connection for vacuum filtration assemblies using larger suction flasks. The sleeve has an inner upper diameter of 33 mm and a height of 15 mm, making it suitable for both 250 ml and 500 ml suction flasks. Its turned-over rim facilitates straightforward seating on the flask neck and stable contact with the stem of Büchner funnels or Filternutschen, helping preserve vacuum integrity during filtration. Delivered as a single piece with a net weight of 0,014 kg, the accessory supports solid-liquid separations, precipitate recovery and sample clarification in analytical and preparative laboratories. The rubber material conforms to common laboratory glassware dimensions and allows repeated assembly and disassembly of filtration trains without additional adapters. This component from manufacturer Witeg is intended for routine use in research, teaching and quality-control settings where reliable Nutschendichtungen are needed. Matching the neck sizes of mid-volume suction bottles, the sleeve enables efficient filtrate collection and maintains consistent sealing performance across successive vacuum filtration operations involving standard Büchner-type funnels.
This article is part of Erlenmeyer flasks, in Beakers & flasks.
Key features
- Pack size: 1 pc
- Inner diameter (top): 33 mm
- Height: 15 mm
- Suitable for: 250 ml and 500 ml suction flasks
- Design: turned-over rim
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Questions about Rubber ring for filter funnels, inner
What is this article?
Rubber ring for filter funnels, inner is the article on this page. Luminix Health distributes Witeg for laboratory use. It sits in Erlenmeyer flasks, inside Beakers & flasks, in Labware.
An Erlenmeyer, or conical, flask has a flat base and a narrowing wall so a liquid can be swirled. It is the ordinary culture and titration flask. A baffled wall is a different article, used when the swirl must turn the liquid over.
A beaker is an open working vessel: easy to pour, poor as a measure. An Erlenmeyer flask has a flat base and a conical wall so a liquid can be swirled without climbing out. A round-bottom flask is for heating under a condenser, because the heat meets a curved wall and the joint at the neck connects to the rest of the glassware. Borosilicate is the glass that survives the temperature change. These forms are listed under ISO laboratory glassware.
Which category should I open next?
The category is Beakers & flasks. The sub-category is Erlenmeyer flasks. The catalogue is Labware.
Shelves beside this one are Round-bottom flasks, Beakers, Reaction vessels & jacketed vessels, Flat-bottom flasks, Flasks (other) and Beaker & flask 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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We deliver across the EU, usually within two to five working days. More is on Delivery across the EU. 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.
