1st stage Compact The Calypso is compact, easy to pack and easy to store High-Flow Piston Technology Ensures great performance and excellent reliability. The large-diameter piston gives you more stable pressure out Intuitive Design Designed with large holes in end caps for easy cleaning and better thermal exchange and improved resistance to freezing Second Filter Includes a second filter, which can be change without dismantling and provides increased protection from polluted air Prevents Water Retention Open-yoke screw helps prevent water retention Protects Against Shocks The dust cap adjacent to the body protects the yoke inlet fittings against shocks