ACR 9490.1 Hydro Release is a precision-built, water-activated release unit designed to safeguard your EPIRB deployment. When submerged in water between 5 and 13 feet (1.5–4 m), the HydroFix™ mechanism disengages the release rod, enabling the Category 1 bracket to free the EBIRB quickly and reliably. This innovative, patent-pending release rod system does not rely on a battery, a sharp blade, or a pyrotechnic device, delivering a safer, simpler, and more dependable emergency release.

Why choose HydroFix

• Patented, battery-free release — a unique HydroFix release rod system that operates independently of power sources or blades for peace of mind in emergencies.
• Water-activated reliability — designed to activate precisely in the submerged depth range of 5–13 ft (1.5–4 m) to ensure timely EBIRB deployment.
• Individually tested — each HRU is tested to the highest standards, reflecting ACR’s 50 years of quality craftsmanship and reliability.
• Part of the standard replacement kit — now included in replacement kits for multiple EPIRB models and brackets, ensuring easy maintenance and compatibility (see model list below).
• Compatibility at a glance — designed to work with Satellite 406, Satellite2 406, RapidFix 406, GlobalFix 406, Sea Shelter, and Sea Shelter2 systems (not for use with RLB-23 406 EPIRB fully enclosed bracket, P/N 9435/9455).

Compatibility and product details

The HydroFix unit is part of the standard replacement kit for the following EPIRBs and brackets:

• Satellite 406™ (Closed and Open Face Brackets) Model: RLB-27 P/N 2754/2756/2772
• Satellite2 406™ Model: RLB-32 P/N 2774
• RapidFix™ 406 Model: RLB-33 P/N 2776
• GlobalFix™ 406 Model: RLB-35 P/N 2742
• Sea Shelter™ P/N 9327
• Sea Shelter™2
• Not for use with RLB-23 406 EPIRB (fully enclosed bracket) P/N 9435/9455