This total relief valve kit provides a direct factory solution for internal component failures

black-bodied unit is the direct replacement for the legacy M572-8308

Connecting it to a 120V line will damage the internal motor and control components

Manual Override Lever: Simplifies the commissioning process by allowing manual opening for system filling and air purging

Can I use the 5D51-90 for low-voltage burner circuits

Lochinvar & A.O. Smith 100173748 Cut-Off Els PW 17895 This total relief valve kitThe Lochinvar & A. O. Smith 100173748 is a critical Low Water Cut Off (LWCO) safety control designed to protect hydronic and steam systems from dry fire conditions. Functioning as an Auto Reset sensor, this component continuously monitors the boilers water level and breaks the 24V control circuit to the burner if a low water threshold is detected. This specific HVAC replacement part is essential for maintaining operational safety in residential and