837 Electromechanical Temperature Switch Accessory, Thermostat Well, Brass, Remote Standard Capillary , 3.75 in Bulb Size, External Pressure Rating 1000 PSI At +600F Maximum 837 Electromechanical Temperature Switch Accessory, Thermostat Well, Brass, Remote Standard Capillary , 3.75 in Bulb Size, External Pressure Rating 1000 PSI At +600F Maximum