The Polish shot-stopper has spent over five years at Old Trafford and arrives at Vicarage Road to help the Championship outfit pull away from the relegation zone
The shot-stopper has been with the Red Devils for the last five-and-a-half years, but made his bow into English football after arriving at West Brom in 2004 from German outfit Hertha Berlin.Kuszczak has appeared for United 32 times since 2006, including six appearances during an initial season-long loan at Old Trafford.
The Pole will wear the No. 35 shirt for the Hornets and joined up with the rest of the team on Tuesday afternoon after the necessary paperwork was complete.Watford have dealt with United before when it comes to goalkeepers, after the Championship outfit loaned Ben Foster for two campaigns between 2005 and 2007.
The Hornets have sought to strengthen between the sticks after the poor recent form of Scott Loach and the decision to send Rene Gilmartin on loan to Crawley Town.