Imeant to say copper ring. Idont know why i said brass. Ilooked at the head and it looks like there is a lot of wear where the ring seals the plug. It seems to be a well built truck. I will be able to tell more about it once i actually get it to run and not spew fuel out of the head. Iam going to check tower hobbies and see if they sell a replacement head for it. Thanks for your help!