Piper Jaffray analyst Peter Keith view yesterday's preliminary dumping ruling on Chinese mattress imports by the U.S. Department of Commerce as a slight positive for domestic mattress manufacturers and suppliers, but also "somewhat disappointing." While an affirmative dumping ruling was widely expected by the industry, the 40%-85% duty rates imposed on Chinese importers are modest relative to expectations, Keith tells investors in a research note. The analyst still does not see mattress import prices at retail surpassing the "all-important" $500 level, which he believes will still place import prices below a majority of domestically produced products. And the largest importers likely won't have to change price at all, says Keith. He views yesterday's news as a "very modest positive" to Leggett & Platt (LEG), and an even smaller benefit to Tempur Sealy (TPX).