Oceanic Aeris SideScan Hose Mount Scuba Diving Compass Dry Boxes a one-way rubber flapper located

a one-way rubber flapper located on the deck near the rear of the boat opens to drain the water then quickly closes to prevent backwash

which provides maximum amount of lift and keeps you properly orientated on or below the surface

Extremely Durable Vinyl Construction

it is a miniature air system

Oceanic Aeris SideScan Hose Mount Scuba Diving Compass Dry Boxes a one-way rubber flapper locatedFeatures: Proprietary design ensures quick response and smooth movement Top or side reading OceanGlo luminescent floating card absorbs light and glows approximately 7 times faster and longer than other materials High visibility lubber line Large ratcheting bezel Direct and reciprocal index points Details: Find your way. For reliable underwater navigation, the SideScan Compass is hard to beat. Large, easy to read bearing indicators on Oceanic's