Open Box Oceanic Zeo + FDXI, Yoke, Swiv, BKDesigned for Depth. Try telling an engineer that a design, any design, cant be made better. In our case that challenge led directly to the ZEO. We started with the EOS, a legendary regulator known for its comfort and breathing profile and ended up with the ZEO. Like its predecessor the EOS, the ZEO is also a phenomenal breather allowing the diver extensive control over the air flow profile at any depth. It takes this design one step further however by