HydroFix Hydrostatic Release Unit for Category I EPIRB Product No.: 9490.1 A patented rod system 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. Note that this is a date-stamped product and must be replaced every 2 years from the date of installation or 4 years from the date of manufacture. **Allows release of a beacon from a Category I bracket when submerged in water between 4.9 - 13.1 (1.5 - 4 m) **Easily replaceable **100% factory tested Fits: Open Face, Sea Shelter Sea Shelter 2 and Sea Shelter 3 brackets Size: 2.5" x 3.4" x 2.0" (6.3 x 8.6 x 5.0 cm) Weight: 3.3oz (93.6 g) Not for use with the follownig outdated EPIRBS: 2754,2756,2758, and 2759