GE Panametrics C-RR [PT9-CRR-05-NT] C-RR-591 (0.5MHz) for -40 to 302°F and Pipes 6 Inches or Larger . Pair of large pipe C-RR transducers for -40 to 150 deg C (-40 to 302 degF) applications, 150mm (6 inch) or larger pipe size (C-RR-505, 0.5MHz), includes transducer holder for PT9 fixture.