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The rugged 69H pressure switch is designed for the demanding requirements of large, heavy duty commercial compressors (up to 250 psi). Sturdy painteed steel case and cover resists the harsh conditions encountered in industrial applications. An automatic unloader valve is also available on the 69H Class. Features: *1/4" female NPT with pulsation orifice *Easy Adjustment *No drift pressure settings *Ample wiring room. 2 ground screws *Visible contacts *UL listed #E14861 *CSA certified file LR36854 *5 HP 250 PSI max *Rugged steel case and cover