The Portagas push button, fixed-flow regulators are designed for use with our Portagreen MegaBump™ cylinder. The flow is fixed to deliver consistent fixed flow with one push of the button. The gas outlet is a 3/16" hose barb with preset flow set at .5 LPM. These regulators are brass nickel-plated body for non-reactive and reactive gas service. An easy-toread pressure gauge is included.