The Envoy (under $300 price class): "Zeagle's redesigned Envoy was the only reg in it's price class to earn perfect simulator scores, even at the most demanding RMV/ depth. It also delivered far and away the best in-water performance. An easy breather in all positions and extremely dry, the Envoy has a forceful purge and a dive/ pre dive lever that is very effective in controlling surface free flows. ..The Envoy offers the best warranty in it's price group” –Rodale's Scuba Diving, Nov. 2003: Best New Regs More Information on this Review Work of breathing at heavy demand*: 1.05 Joule/Liter *198' (60M) depth, 750 psi inlet, 62.5 RMV (liters per minute respiratory volume) ENVOY FIRST STAGE FEATURES: High Performance Porting Conical Precision HP valve Balanced Diaphragm Yoke or DIN inlet available 5 Low Pressure Ports (3/8”-24 UNF) 2 High Pressure Ports (7/16”-20 UNF) Weight 1.88 lb. (.89 kg.) Intermediate Pressure: 135-150 psi (9-10 bar) First Stage Materials: Body: Brass O-rings: Buna-N Seat: Advanced Polymer HP Valve: Stainless Steel ENVOY SECOND STAGE FEATURES: Downstream valve Balanced Diaphragm Dive/Pre Dive Venturi Control Weight: .42 lb. (.26 kg) ( w/o hose) Hose Length: 30 in. (.76 m) Second Stage Materials: Cover: Flexible Thermoplastic Case: Thermoplastic Poppet Seat: Elastomer O-Rings: Buna-N Diaphragm: Elastomeric Polymer Exhaust Valve: Elastomer Mouthpiece: Silicone Like all Zeagle regulators, The Envoy comes factory ready for use with EAN/ NITROX to 40% O2. More Resources: A comparison chart showing all Zeagle regulators Information on Alternate Air sources Popular Regulator Accessories. A printable PDF data sheet on the Envoy regulator. Breathing Performance Chart for the Envoy .