Hose barb

Hose barbs are cylindrical pieces or parts for attaching and securing of hoses (tubing).

The barb-like rings on the cylindrical piece allow for an easy push-connection of flexible-plastic or rubber tubing that is not so easily disconnected.

Hose barbs are used in machine perfusion and chemistry laboratory equipment.

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Cross section of a Büchner flask . Note the hose barb pointing right for attaching a vacuum source.
At the top of the picture we can see a dozen hose barbs (brass).