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The S-4004UA is a direct replacement part
check the nameplate for specific inverter-duty ratings if you intend to use it with a VFD
Standard replacement covers typically utilize existing #4-40 hex or Torx tamper-resistant screws
making it the ideal solution for moving liquids from lower to higher pressures without the maintenance headaches of mechanical seals or motor failures
Lochinvar & A.O. Smith 100110887 Switch 326010-701 The S-4004UA is a directThe Lochinvar & A. O. Smith 100110887 Blocked Outlet Switch is a critical safety component engineered for BTH 400A Series 100 101 gas water heaters and compatible Lochinvar Knight boilers. This normally closed switch is calibrated to a 1. 39 inch water column, providing precise monitoring of the exhaust vent airflow. Designed to detect back pressure or obstructions in the flue, it serves as a fail safe by interrupting the 24V control circuit to the
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