ARB's new CKMTA12 twin on-board compressor kit was designed to fill the market need for a compact sized yet high-volume compressed air source to suit the high volume airflow needs of most air powered tools, and also to suit the actuation and control needs of the ARB Air Locker, and the harsh and demanding environment of the ARB Air Locker user. Dimensions : 10.9 L X 7.5 W X 4.1 H inches. // The unique ARB505, patented design of the E-Z deflator allows for removal of the valve core for rapid tire deflation, while also providing accurate tire reading via the simple movement of a sliding valve.