Open Box Zeagle F8 1st Stage with F8 2nd StageZeagles flagship regulator. Environmentally and dry sealed. The Zeagle F8 first stage, complemented with a flagship 2nd stage, is one of the best performing diaphragm regulators on the market today. When building the F8 Regulator, we partnered with Atomic Aquatics and engineered over 20 improvements on everything from inner mechanisms and materials to exterior controls and aesthetics. Whats the result? The F8 breathes better, works harder and lasts