Solas Rubex 4 - Interchangeable aluminum inflator (9513-143-19) Interchangeable with Flo-Torq and Vortex system. SOLAS - High performance rubber bushing Four-blade aluminum impeller. Exclusive Solas casting process. Wide blade design specifically for 4-stroke engines Increased static thrust for heavy loads and maneuverability. Great tin lift and midrange performance Note: Hub not included, must be purchased separately. Item description: 14.2 x 7.5 inches, 4 blades. Manufacturer part number: 9513-143-19.