Atomic Aquatics M1 Regulator - Second Stage OnlyEXTREME PERFORMANCE. NO COMPROMISE. The M1 has an expanded performance range to meet almost any diving condition imaginable. Caves, cold, deep, enriched air the M1 is perfect for recreational divers ready to extend their capabilities or accomplished technical and specialty divers. State of the art metals meet proven Atomic designs to deliver reliable performance to fulfill virtually any need or diving scenario. WHY MONEL? UP TO 80% EAN. THATS WHY.