This is the CCM inline Short Regulator.  It is an adjustable regulator with an operating pressure of 100 - 450 psi.  This Regulator will fit most standard autococker style markers.   

   CCM products are designed and manufactured in the United States and are machined from high quality materials such as 6061 air craft grade aluminum, 300 series stainless steel, and durable plastics such as delrin and lexan.
MADE IN THE USA