the Robertshaw 5500-136 utilizes 8-32 UNC mounting threads and includes a universal break-off shaft to match varying dial depths

This specific model is the MT variant shipped with mineral oil for R22 systems

Universal Voltage Compatibility: Supports 120V

Proper integration with the Q90-75 boiler series is essential for maintaining the pressure differential profile required by the ignition control board

Eaton Cutler-Hammer C320KGS21 Auxiliary Contact 319852-301 the Robertshaw 5500-136 utilizes 8-32The Eaton Cutler Hammer C320KGS21 is a side mounted auxiliary contact block designed for heavy duty switching applications. This unit features a 1NC (Normally Closed) configuration, providing reliable feedback for control circuits and interlocking logic. Engineered for versatility, the C320KGS21 is compatible with Freedom Series starters and contactors spanning NEMA Sizes 3 5 and IEC Sizes L S. It is also the standard solution for Definite Purpose