Hi Daz, thankyou really appreciate the reply, i would normally only want to purchase genuine parts with the engine being so sensitive but as you explained i thought the metal impeller would be a better alternative to what is there now. Think i will attempt to go for this unless i get a reason not to, i will let you know the outcome as at the moment the noise from the pump from a cold start is unbearable!!! let alone having to top up the water every day.