where can i find a water level switch for my indesit wg1130tpg?

hi the switch is under the lid its a small white or black round switch which has a small air tube fitted to it.
If this has had water in it it will need replacing.
in the bottom of the machine there is a unit that might be blocked follow the tube from the switch remove the unit clean it and put it back in.
if this is blocked it will keep filling up or overfill.
please post a reply thks

ian
March 2005