If your engine is not running as well 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. The more items that are renewed the better the overall refurbishment; leaving nothing to chance?
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 fuel hoses, hose clips, filters and seals for example, and still only pay one fixed price shipping cost.