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this control is a direct fit for AO Smith and Bradford White water heaters
the R400Z-1/2 offers a compact footprint without sacrificing the flow capacity required for demanding commercial combustion environments
Compact Profile: The 1/2" NPT threaded connection and streamlined body geometry allow for installation in tight mechanical closets and terminal units
Verification of the specific wiring diagram and sequence of operation is required before installation
this is the official manufacturer-designated superseding part for the 61-21922-57
Rheem-Ruud 62-102783-81 Control Board 320788-704 this control is a directRheem Ruud 62 102783 81 Integrated Control Board