This is the Limited Edition Atomic SV1 CONTOUR Self Draining Snorkel Features: Open snorkel design Internal scupper valve design to keep airway dry Quick-connect clip Silicone, non-exchangeable Please note the silicone has some discoloration due to storage - it does not affect usability. The SV1 CONTOUR design has a conical flared top to deliver maximum airflow. It is the optimal choice for calm waters or for strong swimming situations. Even though water may enter the open top, the internal tube airway remains dry. The fixed lower section of the snorkel stays close to your mouth. The dual silicone mouth piece prevents over-clenching of teeth that would restrict airflow.