The 25366 may be purchased to replace a damaged desiccant tube. The CS455 is shipped with this small desiccant tube attached to it. The transducer's cable includes a vent tube that terminates inside of the 25366. The desiccant tube prevents water vapor from entering the inner cavity of the transducer.
The 25425 requires an RMA (Returned Material Authorization) from Campbell Scientific. When it is ordered, we will recalibrate the CS455 to meet original specifications. Before and after calibration sheets are supplied with the pressure transducer.