Shares of Pentair plcPNR have plunged 40% so far this year compared with industry's decline of 8%. Click to get this free report Atkore International Group Inc. (ATKR): Free Stock Analysis Report Flowserve Corporation (FLS): Free Stock Analysis Report Donaldson Company, Inc. (DCI): Free Stock Analysis Report Pentair plc (PNR): Free Stock Analysis Report To read this article on Zacks.com click here. In the third quarter of 2018, segment income is anticipated to be flat while Return on Sales ("ROS") is expected to decline roughly 50 basis points mainly owing to inflation, including the impact of tariffs.