Fourth Element Ocean Positive Towel Scubapro Accessories This level of refinement is

This level of refinement is available on all Halcyon second stages

the light head is also available on its own (Item SL6712)

Grommet distance 11"

expanding air simply exits through the bottom as the device ascends to the surface

It also requires no adjustment

Fourth Element Ocean Positive Towel Scubapro Accessories This level of refinement isThe sea sponge; one of the oldest forms of animal life present on our planet today. These ancient creatures have survived millennia because of their simple structure which allows them to adapt and evolve quickly to suit different environments. Sponges and their photosynthesising endosymbionts produce up to three times more oxygen and organic matter than they consume, they filter and purify a huge volume of water every day and make a major contribution