Bare compressor

means the compression element and auxiliary devices (e.g., inlet and outlet valves, seals, lubrication system, and gas flow paths) required for performing the gas compression process, but does not include any of the following:

(1) the driver;

(2) speed-adjusting gear(s);

(3) gas processing apparatuses and piping; and

(4) compressor equipment packaging and mounting facilities and enclosures.