ITACO Impeller 334-65021-0 18-8921 for Tohatsu Nissan Outboard 9.9HP 15HP 18HP 20HP Outboard Motor Shipment:delivery within 24 hours Outer .External impeller overall Diameter: 41.11mm Internal shaft insert /Hub Diameter : 13.88mm 100% Manufactured in TAIWAN ,high quality guaranteed Impeller assured! Estimated Time of Delivery from Singapore: 7-16 working days