Coffee Sensor AirBuster® upper cap upgrade to manual valve release function

Coffee Sensor AirBuster® upper cap upgrade to manual valve release function. This upgrade adds a manual valve release function to the standard Coffee Sensor AirBuster® upper cap. Installation requires removing the original upper cap spacer and screw, which are replaced by this simple yet elegant system, consisting of: Lower pusher Spring Upper thumb screw The Coffee Sensor AirBuster® upper cap manual release upgrade is manufactured entirely from stainless steel. It was developed for users who have reported a valve pin remaining stuck in the closed position after a shot. To manually release the Coffee Sensor AirBuster® upper cap upgrade to manual valve release function, press the thumb screw quickly and do not hold it fully depressed for an extended period.A splash of hot water may occur. Warnings !!! Do not use this upgrade during group head back flushing. This is an experimental upgrade. Use it at your own risk and only if you fully understand its function and operation.