ARH100 Automatic Hydrostatic Release Housing The ARH100 is manufactured in a durable and highly UV stable plastic and provide excellent protection of the unit until it is required.ARH100 automatic release housing, containing a hydrostatic release mechanism which automatically deploys the EPIRB if the vessel is sinking Note: IMO regulations require an automatic release housing to be provided for mandatory fitted EPIRB’s.WARNING: This product can expose you to chemicals including di(2-ethylhexyl)phthalate (dehp) which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.