Fenwal ThermoWell 11201-0 for Fenwal Thermoswitches model 170XX. Fenwal well has 321 Stainless Steel well and Hex Head. The Fenwal well is .662 diameter and 3.59 inches long. The mounting threads are 3/4 inch NPT. Heliarc welds seal the threaded fitting to the well. Fenwal part number 11201-0.FENWALTHERMOSWITCH
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