LiquiDynamics Bulk System - 275 Gallon, 50 Ft., Model# 970020-50 Digital meter can be set to display pints, quarts, gallons or liters Analog level gauge allows the user to monitor tank fluid level while a lockable vent fill cap provides easy access for tank filling Separate 3in. bung opening is provided on the tank for installation of an emergency vent if required (Item# 110031, sold separately)