RTI Priest/Prophet 1 Adjustable Tuning RegulatorHuma Air Adjustable Tuning Regulator For The RTI Priest and Prophet 1 The regulator will reduce the outgoing pressure of your rifle's pressure bottle according to your settings and this will result in a constant pelletspeed and better groups. It is equipped with a pressure gauge what will indicate the fill pressure of the bottle and a foster male connection to fill the rifle. The position of the gauge and and foster can be chosen left or right and