Product Info Catalog HVAC Evaporative Coolers Evaporative Cooler Accessories Evaporative Cooler Motor Pulley, 1/3-HP, 3-1/4 x 1/2-In. Evaporative Cooler Motor Pulley, 1/3-HP, 3-1/4 x 1/2-In. Request a Quote UPC: 26529612401 Manufacturer: Dial Mfg Inc SKU: 895359 Model Number: 6124 3-1/4" x 1/2", variable pulley, for 1/3 hp motors. Zinc construction. 1/2" bore.