The Union 2201 5 Lever Mortice Sash Lock comes with a 10 year guarantee! This Union lock replaces the Chubb 3U75. Union's version of the popular UK Mortice Sash Lock, available in 64mm & 76mm Cases sizes & two finishes Brass & Satin Chrome. Operation Deadbolt is locked or unlocked by key from either side Reversible latchbolt..