BACK RAILSBACK RAILS ARE USED TO SPACE UPRITES, RETAIN AND REINFORCE BACK PANELS, AND SPLICE TWO-PIECE BACKS. ALL ISLAND AND WALL SECTION HEIGHTS REQUIRE AT LEAST ONE TOP RAIL, ONE CENTER RAIL AND ONE BOTTOM RAIL. 78in THROUGH 120in HIGH SYSTEMS ALSO REQUIRE ONE SPLICER RAIL. 96in, 108in, 120in HIGH SYSTEMS REQUIRE A SECOND CENTER RAIL. ELECTRICAL KNOCKOUTS INCLUDED ON ALL RAILS. | |||||||||||||||
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