Aquarian Audio Contact adapter

Molded rubber cup fits over the end of the H2a-XLR hydrophone.
The inside is molded to the same size as the hydrophones.
Simply place the hydrophone inside, bed with water for maximum efficiency, and set the flat surface of the cup on the media to which you want to listen.
Use for sound effects, leak detection, surveillance, terrestrial studies, sporting events, or general phonography.