Cornelius soda gun at the bar with 6 buttons: cola, diet cola, club, tonic, ginger ale, water. Lines feed from the BIB (bag-in-box) racks below. Check sniff-test at pre-shift — flat soda is unservable. If a button is flat, swap the BIB or call for service. Never serve flat tonic in a Gin & Tonic — guests notice immediately. Quality tonic for upsells: Fever-Tree bottles, hand-served.