Replacement Hydrostatic Replacement Hydrostatic Release mechanism for Ocean Signal Category I EPIRB&';s. Must be replaced every two (2) years from date of installation. Compatible With: Ocean Signal Category 1 EPIRB&';s*Sold as an Individual 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. Specifications: Type: Mounting Brackets Box Dimensions: 3"H x 9"W x 9"L WT: 0.4 lbs UPC: 5060266110108