HydroFix Hydrostatic Release Unit HRUThe HydroFix Hydrostatic Release Unit HRU is a patented rod system that allows a beacon to be quickly and reliably released from a Category I bracket when submerged in water between 4.9 to 13.1 1.5 to 4 M. Does not rely on a battery, blade or pyrotechnic device to release the beacon. This advantage allows for a quick, seamless and reliable release in an emergency.This is a date-stamped product and must be replaced every 2 years from the date of installation o