This is an OEM Replacement Part manufactured and branded by AllPoints - AllPoints 421903 Timer, 60 Min. 24V, 60Hz. This timer is designed to replace Blodgett 37317 and is compatible with Blodgett Ac-500 Xcel, Dfg-100 Xcel, and Mark V Xcel Series. For Knob Use # 22-1621.