This is a vent cover to protect from rain or rodents. The adapter fits right over exposed PCV opening and the cap threads on.
Two sizes are available to fit over 4mm thick PCV pipes:
Prints upside down with no support.
You shall not share, sub-license, sell, rent, host, transfer, or distribute in any way the digital or 3D printed versions of this object, nor any other derivative work of this object in its digital or physical format (including - but not limited to - remixes of this object, and hosting on other digital platforms). The objects may not be used without permission in any way whatsoever in which you charge money, or collect fees.