This bottom tap keg has a 4" neck which alllows for easy cleaning and it hold nearly 26L . The screw cap has a pressure release and a CO2 introduction valve to let any excess gas to be realeased automatically and gas can be introduced if the pressure in the keg drops. This is the ideal barrel for the connoisseur, who is prepared to leave his beer up to mature, condition and clear to perfection. The bottom tap barrel is supplied with the S30 valve. Red gas injector and gas bulbs not included.