Hollis DCX First Stage Dive RegulatorThe DCX high performance, over balanced first stage, provides progressively greater intermediate pressure as depth and gas density increases for superior gas delivery under the most extreme conditions. Based on the DC1 the DCX also has a 5th low pressure port that points directly down from the first stage providing easy hose routing for backmounted doubles, sidemount or even for recreational divers. It differs from the DC1 in that it is lighter and