Polaris 1-516-03 Metal Spa Blower, 1-1/2-Horsepower 240-Volt Enjoy the soothing effects of powerful, invigorating bubbles in your spa Thermally protected blower motor shuts off automatically under excessive operation temperatures for protection against motor damage. Restarts automatically after cooling. Built-in check valve adds protection against blower damage from water surges Rugged steel construction UL listed for both indoor and outdoor use