Johnson Controls A19EBB-1 Temperature Control Els PW 17895 What is the difference between

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Rugged Construction: High-density cast iron resists wear and deformation under heavy mechanical loads

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Durable Construction: Built to withstand the thermal cycling and humidity levels common in boiler rooms and outdoor pool heater enclosures

Johnson Controls A19EBB-1 Temperature Control Els PW 17895 What is the difference betweenTemperature, Mechanical, 24 to 277Vac, SPST, Open High, Automatic Reset, 100 to 350 degree F Setpoint Range, 9 to 36 degree F Adjustable Differential, 240 to 350 degree F Adjustable Dial Stop, 6" Liquid Expansion Bulb, Warm Air Temperature Control with Knob Range Adjustment and Duct Mounting Flange This item does not qualify for free shipping.