Product Info Catalog HVAC Evaporative Coolers Evaporative Cooler Accessories Evaporative Cooler Motor Pulley, 1/2-HP, 3-1/2 x 1/2-In. Evaporative Cooler Motor Pulley, 1/2-HP, 3-1/2 x 1/2-In. Request a Quote UPC: 26529614504 Manufacturer: Dial Mfg Inc SKU: 550886 Model Number: 6145 3-1/2" x 1/2", variable pulley, for 1/2 hp motors. Zinc construction. 1/2" bore.