The manufacturer of the Acquity Leak Sensor, Waters is Waters. New Waters Acquity Leak Sensor p/n 205000505. The leak sensor assembly is used on only the current versions (2007 and forward) of the following detectors: Acquity UPLC PDA, Acquity UPLC eLambda PDA, Acquity UPLC FLR, Acquity UPLC ELS, and Acquity UPLC TUV, as well as the Acquity BSM, Acquity Sample Manager, Acquity Column Manager and the Acquity Column Heater /Cooler. It is also used in the 2545 Quaternary Gradient Module, the 2535 Quaternary Gradient Module, and the 2555 Quaternary Gradient Module.