We thought you might like to try and get your own plumbing skills InSink!
Use the available pieces to create a sealed connection before the time runs out and the sewerage starts to flow down (thanks to Neil we know that $h!t doesn't flow up hill).
If you finish quickly, you can click the timer to start the flow immediately.
As the levels increase, the more intricate your plumbing skills need be. You don't have to use all the pieces, but as in real life, sometimes the simplest solution is often best.