Bunn O Matic Model-IC3 Panel, Access Trunk Extension Only -- 1 each.Brews 20 gallons of perfect iced coffee per hour. Brews directly into any style portable server up to 20 inches tall. Height is easily changed by adding or removing trunk extensions. Meet your volume needs; brew either 2 or 3 gallons of iced coffee at a time. Tailors flavor to customer preference.