I will give you two tips: There are two, and one is for the ladies.
The first one is a prototype of a toilet for female cosmonauts. It was flown for the first time in the Vostok 6 spacecraft. The second one is a space toilet that went to orbit in the Soyuz 3.
I know. They look scary, unlike today's top-of-the-line NASA toilets. But then again, this was the Soviet Union's space program, where many cosmonauts died for engineering and manufacturing problems—and nobody ever knew about them. [Discovery]