The Chamberlain Group Inc., Elmhurst, Ill., has made several enhancements to its LiftMaster models SL570, SL580, and SL590 heavy-duty slide gate operators. New features include a larger control box for easier access to major components with improved terminal strip labeling, and an integrated three-button control station. The SL575 and SL585 models include a large accessory tray and a lockable external manual disconnect

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