Grid Controls M 210 Flow Switch [10A] [2" Spg] (57 F1 2212 01W) heaterparts Higher speed supports jet performance Higher speed supports jet performance while lower speed maintains circulation A properly selected replacement helps restore intended over temperature protection without forcing the repair around a near fit substitute The 2 inch spigot configuration gives this switch practical value because it is intended to integrate into plumbing systems with that larger fitting format This type of part is especially useful when a worn or inaccurate switch is causing operational inconsistency or interfering with normal safety sequencing