1. 
   ballcock
   [n] - floating ball that controls level in a water tank
   Found op http://www.webdictionary.co.uk/definition.php?query=ballcock
   
   
2. 
   ballcock
   ball cock noun floating ball that controls level in a water tank
   Found op http://wordnetweb.princeton.edu/perl/webwn?s=ballcock
   
   
3. 
   Ballcock
   A ballcock (also balltap or float valve) is a mechanism or machine for filling water tanks, such as those found in flush toilets, while avoiding overflow and (in the event of low water pressure) backflow. The modern ballcock was invented by Joseph Bramah and Thomas Twyford.{Citation needed|date=Feb...
   Found op http://en.wikipedia.org/wiki/Ballcock
   
   
4. 
   BALLCOCK
   A fill valve device in a toilet tank. A 'Cock' is activated by a float 'Ball' to refill tank water after a toilet is flushed.
   Found op http://www.tjader.com/glossary.html
   
   
5. 
   ballcock
   1) Ball cock 2) Floating ball that controls level in a water tank 3) Regulator
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/ballcock/1
   
   

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