Swimming pool cleaning apparatus and parts therefor

A fluid distribution system adapted for controlling the operation of a device for cleaning a swimming pool and the like, comprising a housing having an inlet for receiving a supply of pressurized fluid, a pair of outlet openings and a valve chamber positioned between said inlet and said outlet openings, said housing including a piston chamber positioned on one side thereof and having a first side, which is located adjacent said valve chamber and is in fluid communication with said valve chamber, and a second side, which is spaced outwardly from said first side;

• a piston movably mounted in said piston chamber so as to be movable between a first position, in which said piston causes one of said outlet openings to be closed, and a second position, in which said piston causes another of said outlet openings to be closed, said piston having a third side, which is located adjacent said first side of said piston chamber and has a first size, and a second side, which is located adjacent said second side of said piston chamber and has a second size which is greater than said first size of said third side of said piston, said piston having a passage extending therethrough so as to permit flow of pressurized fluid from said valve chamber to said second side of said piston chamber;
• and at least one valve in fluid communication with said second side of said piston chamber such that when said valve is in a closed condition, said second side of said piston chamber is pressurized by pressurized fluid flowing from said valve chamber to said second side of said piston chamber through said passage of said piston so as to cause said piston to move to its said first position and such that when said valve is in an open condition, said second side of said piston chamber is depressurized so as to cause said piston to move to its said second position, whereby flow of pressurized fluid from said valve chamber to one of said outlet openings is selectively controlled by causing said valve to be in said open or closed condition.