Assertion: conduit's end | /r/HasProperty | retracted through the aperture
Facets:
Source sentences:
text: Only one of the cord receiving apertures 64, 66 is used at a time, the other aperture being temporarily closed against the outflow of air by means of a removable stopper 74 formed of resilient material, and having ,a bulbous inner end 76 which can be retracted through the aperture, but yet, when acted on by air pressure, blocks the outflow of air through theaperture.