This is the "bullet" shaped IVG cap for the CCM MBP.  This IVG cap is broached with a 1/4" hole which allows access to the IVG with a 3/16 allen key.  The IVG cap can be removed with a 1/4 allen key.  Also compatible with the CCM T2.   

   The IVG cap is available in raw 6061 aluminum only and we recommend anodizing it before use.

   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