The smaller to the two in that picture.
Looking at my engine, there is a hexagonal flat surface for the pipe to attach to, with a tiny small hole in the middle. Im guessing the pipe is force around the hexagonal surface of the head, but can someone confirm? Its going to be a very very tight fit if thats correct, so if anyone has any tips, feel free 🙂
Apologies for using this board, it seems the fastest of them all and i want to get it running tomorrow if i can 🙂