For FLEX-SELECT Broadcast Spreaders. High Output Tray and and Shut-Off Kit for large particle size and high application rates. High Output for large gauge materials including grit and rock salt. Low Output Tray and and Shut-Off Kit for small seed and very low application rates. Low Output system with exclusive oscillating shut-off makes poor flowing materials easy to spread evenly. Fits both EarthWay 80lb and 130lb FLEX-SELECT hoppers. Fully emptying hopper. Exclusive oscillating pins in shut-off makes poor flowing materials easy to spread evenly. Fully emptying hopper.