Product Info Catalog HVAC Evaporative Coolers Evaporative Cooler Accessories Evaporative Cooler Motor Pulley, 3/4 HP, 3-3/4 x 1/2-In. Evaporative Cooler Motor Pulley, 3/4 HP, 3-3/4 x 1/2-In. Request a Quote UPC: 26529614900 Manufacturer: Dial Mfg Inc SKU: 550924 Model Number: 6149 3-3/4" x 1/2", variable pulley, for 3/4 hp motors. Zinc construction. 1/2" bore.