Compact machined first stage based on the expedition tested Apeks DS4 platform. Break through, innovative over-moulded first-stage endcap and environmental diaphragm helps prevent ice build-up that can cause first stage free flow in extreme circumstances. High performance pneumatically balanced lever operated poppet valve. Large, over moulded self-flushing and controllable purge button. Ergonomic Venturi lever is easy to use and locate. White flexible nylon braided hose has better cold water performance than traditional rubber hose.