Hose barb fitting

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Cross section of a Büchner flask. Note the hose barb pointing right for attaching a vacuum source.
Aspirator with a hose barb fitting
on the right arm
A copper aspirator. The water inlet and outlet are at the top and bottom, respectively; the air inlet is on the side.

Hose barb fittings 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 barb fittings are used in machine perfusion and chemistry laboratory equipment.