Mares 62X First Stage Regulator62X First Stage Regulator The 62X first stage breaks records as the smallest first stage in the diving market: it measures 63 mm and weighs only 464 g (DIN). This small but powerful diaphragm first stage is 10% smaller and lighter than its 52X predecessor and has 30% less volume. Equipped with Auto Sealing (AST) technology that protects against water entering the first stage. The core of the 62X has been redesigned to for an even better seal, making