Seafloor Replacement Hatch Seals for HyDrone – Pack of 4 Maintain a secure seal on compatible Seafloor HyDrone access hatches with this replacement hatch seal set. Designed as replacement components for the HyDrone platform, these seals help maintain proper closure of the vessel's access hatches during hydrographic survey operations. Key Features Replacement hatch seals designed for compatible Seafloor HyDrone survey vessels. Helps maintain a secure seal around access hatches when existing seals become worn or damaged.