The Flow-by Piston design of the TILOS Air Essence II 1st stage provides greater reliability and serviceability compared to previous model, while improving responsiveness and performance at all breathing rates. First Stage Compact and lightweight Flow by balanced piston design 4 low pressure ports (3/8"" - 24 UNF) 1 high pressure port (7/16"" - 20 UNF) Meets CE Certification standards Weight 1.55 lbs (.70 kg) Service kit available (Tilos Item# SK-7000) Second Stage Stainless steel rings Dive/predive adjustable venturi switch Extra comfort long bite silicone mouthpiece Hose length 27 in (.69 m) Meets CE Certification standards Weight 0.40 lbs (.18 kg) Service kit available (Tilos Item# SK-7000) Maximum service pressure: 3000 psi Medium pressure Air Essence II: 135-145 psi Work of Breathing (at heavy demand): 1.6J/liter RMV: 50m, 3000 psi, 25 bpm
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