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Ok so I finally got the pipe out was a massive pain In the bum..!!! So I believe it is the heater water pipe that feeds the back of the engine but would love to know what it really is.. U can see the pipe that broke off n rendered me gq useless.. Was glad it happened at home not on a trip I doubt u could fix it in the bush..! Was a 24mm spanner size for future reference the only one I didn't have lol..! Still need to go hunting for a new one of these will let u know how I go puttin it back in..!