shares of pentair plc pnr inched 042 higher to 5785 tuesday on what proved to be an allaround rough trading session for the stock market with the sp 500 index spx falling 116 to 411958 and dow jones industrial average djia falling 108 to 3368453 pentair plc closed 300 short of its 52week high 6085 which the company achieved on february 2nd