Pop-up <a href="https://en.wikipedia.org/wiki/Plug_(sanitation)" class="extiw" title="en:Plug (sanitation)">plug/stopper</a> for a <a href="https://en.wikipedia.org/wiki/Sink" class="extiw" title="en:Sink">sink</a> in the open state.
<ol><li>Valve plate with gasket</li>
<li>Inlet from basin overflow</li>
<li>Sealing ring</li>
<li>Screw for height adjustment</li>
<li><a href="https://en.wikipedia.org/wiki/Ball_joint" class="extiw" title="en:Ball joint">Ball joint</a></li>
<li>Actuator arm</li>
<li>Joint</li>
<li>Control arm</li></ol>
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This  image was created with <a href="https://en.wikipedia.org/wiki/Blender_(software)" class="extiw" title="w:Blender (software)">Blender</a>.