Description: Water pump impeller made of upgraded Rubber ,quality assure and durable. Water pump impeller same as factory old part and easy to install,direct replacement. Impeller secures onto shaft with a pin that passes through the impeller,fits for Johnson HJB-O-155A. Impellers engineered for over-performance,manufactured for extra-long service life,quality is guaranteed. Easy installation,keep a spare in the toughest marine environment with chemical resistant neoprene impeller. Specification: Material: Rubber Size: Approx.10x10mm/0.39x.039inch Package Includes: 1 Piece Rubber Impeller Note: Please allow 0.5-1inch difference due to manual measurement.(1 inch=2.54cm) Color may be slightly different from the pictures because of different screen and light. Please kindly understand. Thank you!