If your engine is not running as sweetly as it once did, have you thought about a complete carburettor overhaul? The part shown in the image, is just one item of a few you may require to return to smooth running and first prod starting.
Other items you may wish to consider:
Check the schematic and take better informed decision when placing your order. This will also help you order the correct number of parts, this being displayed in the right hand column.
Add as many items as you wish to the same shopping cart, new hoses, hose clips, filters and seals for example, and still only pay one fixed price shipping cost.