Light Blue Ambient Filter for Hydra and SF Mini 15K/18K Series
 
This ambient filter will fit the Hydra 15000, Hydra 18,000, and the Solar Flare Mini 15,000 and 18,000.
This filter is also compatible with the Hydra 8000 (with or without dome) and the LTD 10,000/12,000.
 
It is designed for blue water in a depth range of 10-18m (10-40ft)