HomeAll Products4.2" 6-RIB ALUM SERPENTINE PULLEY FOR CAST IRON PUMP: 50120000SKU: 501200004.2" 6-RIB ALUM SERPENTINE PULLEY FOR CAST IRON PUMP: 50120000$97.40PriceQuantity*Add to CartAll KRC pulleys are black hard anodized to 62 Rockwell hardness.