A Flown Soyuz – Mir Space Toilet

Up for auction at Christie’s:

A space toilet can be used in a low gravity environment. In the absence of gravity the collection and retention of liquid and solid waste is directed by use of air flow. Since the air used to direct the waste is returned to the cabin, it is filtered beforehand to control odour and cleanse bacteria. Waste water is vented into space and any solids are compressed and stored for removal upon landing.

(via Nothing to do with Arbroath)