Scubapro MK2 EVO First Stage Regulator, Din – Classic Downstream Piston, Cold-Water Ready & ReliableThe Scubapro MK2 EVO First Stage Regulator, DIN is the only downstream piston style first stage with internal components designed to resist freezing in extreme cold water conditions. A favorite among divers who value simplicity, reliability, and affordability, the MK2 EVO is built to perform in diverse environments while offering easy maintenance. Key Features: Classic downstream piston design with chrome plated brass body for strength and durability.