Pipes are made up of different parts, with three main ones:
Pipe Lines - This is where Fluids move through. You cannot see Fluids moving through it, however.
Nozzle - This part releases fluids. Some may also have a Tap, which control when fluids are released. Nozzles "queue" fluids when the drain captures them and then release the fluid in the order they entered it; taps, however, will only make the drain collect fluids as fast as the nozzle can release them.
Drain - This part captures fluids. The Drain then takes it to the Pipe Line, where it is released by a nozzle or taken out of the level.
Water or Fizzle is Released
Where's My Mickey? is the first game for Fluids to use the same sound when they are released from a Pipe.