Easy Tapper Add-A-Thermowell. Install our Precision Stainless Steel Dry Well on any Operating Pressurized Pipeline. You can then place a temperature sensing devise in the center of the pipeline, where it should be for the most accurate temperature readings. Our Add-A-Thermowells are also Ported with a side outlet for sampling Fluid Quality and Pressure. Install 1 on each side of a Coil or Pump and track 'Delta P' (Pressure) 'Delta T' (Temperature).