7 Compressors, namely, air compressors, gas compressors, and reciprocating compressors; pumps, namely, vacuum pumps, reciprocating vacuum pumps, pneumatic pumps, hydraulic pumps, and positive displacement pumps; air distribution units for pneumatically driven pumps; jumper lines and bypass lines for bypassing a device such as a valve to transfer fluid between a high-pressure vessel or pipe and a low-pressure vessel or pipe; jumper lines and bypass lines with valves for controlling fluid transfer between a high-pressure vessel or pipe and a low-pressure vessel or pipe; and jumper lines and bypass lines with pumps, such as solenoid actuated pumps, for controlling fluid transfer between a high-pressure vessel or pipe and a low-pressure vessel or pipe