Atomic Aquatics M1 2nd Stage only, 32" hoseM1 Second Stage Rugged Reliability with Smooth Breathing The M1 Second Stage from Atomic Aquatics is engineered for divers who need dependable performance in the most demanding conditions. Featuring a 32" hose and durable gray finish, this second stage delivers smooth, effortless breathing and rugged reliability for both recreational and technical divers. Effortless Breathing Balanced airflow system ensures smooth, natural breathing at all depths.