The Hammar H20E is activated by water pressure which will automatically release the EPIRB. Instead of the rope sling a specially developed plastic bolt secures the EPIRB, which will be cut when the HRU is activated. Features. Release depth 1.54.0 meters. Bolt, nut and washers shall be replaced when installing a new Hammar H20E. USCGSOLAS Approval BV, MED, USCG Section 6Specifications. Dimensions 6 6 4 in.. Weight 1 lbs