Atomic Aquatics Z3 Regulator Atomic Aquatics Most Compact and Economical Regulator System All the Features of the Z2 and More! NITROX Ready for Mixtures Up to 40% Out-of-the-Box 3/8" Threaded 32" (81.3 cm) Low Pressure Hose Weight: 2.3 lbs (1,070 g)