Atomic Aquatics Semi Dry SV2 SnorkelSV2 Snorkel Advanced Breathing with Sleek Comfort Shop the SV2 Snorkel from Atomic Aquatics at Aquatic Sports. Designed for divers and snorkelers who want premium performance, the SV2 features a dual valve breathing system, a hydrodynamic tube shape, and a soft silicone mouthpiece that makes long sessions in the water more comfortable and efficient. Key Features Dual valve design enhances airflow and helps reduce breathing resistance underwater for a