Connects to the air hose prior to the air tools .Use at the tool end of the air line for precise regulation .Use at the tool end of the air line for precise regulation A must for air paint sprayers and air brushes .Increases or decreases air pressure as desired.Air Inlet NPT: ¼".Air Outlet NPT: ¼" Contact:We will reply your email or fax within 24 hoursYou can call us at any time if there is any ...