Check the listing for details. Cressi MC9 Compact Regulator, Int, Grey. Color: Grey, Condition: New. Listed at 409.95 USD. Ideal scuba diving regulator for beginners and travelers. Hyperbalanced membrane 1st stage plus a compact single-hull second stage. 2 HP and 4 LP ports. Weight: 878 g - 31 oz. Very light and made in Italy. The hyper compensation of the 1st stage mechanism guarantees a slight increase of the IP as it gets down the pressure of the bottle. The regulator supplies, therefore, its maximum level of services in the final phase of the dip, undoubtedly the most critical. The chamber is designed to canalize the air volume directly to the LP exits for reducing to minimal level the fall of pressure in forced breathing (0.5 BAR), guaranteeing a use with high services in any situation. The thicknesses of the walls of the body have been optimized to reduce to the minimum its weight. A case of.