Mounts directly to 2500 ATG Mounts to 2520 High Pressure ATG with 2581 Oil Tight Adapter Mounts to 6700 Liquid Level Indicator with Elbow Drive Accessory Kit Two, four or six SPDT cam-operated switches UL/CSA approved/certified Actuates alarms or relays Switches are user configurable for any desired sequence Cast aluminum enclosure with o-ring seal