Scubapro MK25 EVO/A700 Regulator

With the MK25 EVO/A700 you are guaranteed a reliable, low-effort
delivery of air, no matter how hard you’re breathing, how deep you’re
diving, or what your temperature gauge reads. The MK25 EVO first stage
lets you enjoy an ultra-fast breathing response, instant delivery of air
on demand, great sensitivity and extra-high airflow, regardless of how
cold the water is.