Easily inflate your tyre using a 12 volt air compressor not equipped with a supply tank & pressure relief valve without the need to switch off the compressor to control the inflation & get an accurate pressure reading on gauge.When using a standard 12v air compressor not equipped with a supply tank & pressure relief valve, an accurate pressure reading can only be achieved by turning the compressor off.The Mean Mother Air Compressor Bypass Controller uses a bypass valve to redirect the airflow & stop the inflation process, in turn allowing for an accurate pressure reading without turning off the compressor.The lever mechanism makes it easy to stop & start inflation until the desired tyre pressure is reached, while the convenient locking latch at the front of the controller lets you lock down the lever. This feature is especially helpful where the low-capacity compressors or larger tyres increase inflation times.