Check the listing for details. ScubaPro MK19 EVO DIN 300 First Stage Regulators - (10.719.030). Condition: New. Listed at 519.00 USD. The ScubaPro MK19 EVO is a first stage designed for cold water or contaminated diving conditions. Its new design makes it smaller and lighter than the original MK19 and competitors. The air-balanced diaphragm ensures consistent and effortless airflow, regardless of depth, tank pressure, or breathing rate. It outperforms competitors in terms of airflow and max depth. The swivel and dry chamber are a premium package that meets the needs of tech divers. The environmentally sealed system prevents water and pollutants from affecting the inner mechanism. The new dry chamber is equipped with a double spring for compactness and reliability. The swivel turret has four high-flow LP ports and one axial super high-flow LP port for maximum hose routing options.