(57) An automatic pool cleaner comprising a dive float assembly pivotably mounted to an elongate drive tube 11 for limited movement on both sides of a substantially central position is disclosed and claimed. The cleaner is characterised in that dive float assembly centralising means 21 are provided to ensure that the dive float assembly returns to the substantially central position with respect to the drive tube as a dive float rotates about an axis which is transverse to a longitudinal axis of the drive tube when the cleaner changes to a downward path at a uppermost position on a wall of a pool, thus ensuring that said downward path is substantially vertical.