The Sherwood SR2 is one of the world's best breathing regulators. It is a Dry, Environmentally Sealed Piston 1st Stage. And has a compact, lightweight 2nd stage. The One-Touch performance adjustment maintains the flow of air and venturi with a single knob adjustment. The SMART Demand Lever relieves the load on the Low Pressure Seat when not under pressure. The Dry 1st stage keeps all contaminants out. Five Low Pressure Ports on a 360 degree swivel. Two High Pressure Ports.