This type of toilet is more like a full stand alone unit. In closed coupled toilets the cistern itself is mounted directly on top of the toilet bowl. People use this option of toilet because there are no pipes visible around the unit and it has a seamless look.
A water cistern is the part of a toilet that holds water which is then used to flush the toilet.
If you do not have a dual flush toilet, put a brick in the cistern
The cistern.
cistern
A vacuum breaker is a device that prevents water in a toilet cistern or water tank, from syphoning back into the toilet cistern or water tank.
cistern
cistern
It all depends on the size of the toilet The size of the cistern. the SASE of the cistern outlet, the material that the toilet is made from, the size of the sewerage pipe and what hemisphere you are in.
litres
cc means a close coupled ie a toilet pan and cistern which are attached to each other by bolts and a washer cc can also mean copper to copper... ie: sweated / soldered connection.
When you pull the handle a washer is lifted and the water goes down into the toilet and at the same time the cistern fills up once the washer is back in place from the flushing mechanism