5-line draft system + 1 cask/specialty line. CO2 pressure: 12 PSI standard, adjusted per beer style. Glycol-chilled lines to 38°F. Beer Clean line maintenance: weekly chemical cleaning, every-other-week jumper line replacement. Foam pour issues: usually warm lines, dirty faucets, or low CO2 — escalate to bar manager. Never pour through a dirty faucet.