I have not seen a photo of the PTU on the Sport so I don't know how it differs from mine. This drain is on the bottom of the PTU at it's lowest point pointing down to the ground. Do you have a photo of the Sport version? In looking at this image again I can see why you thought it was not at the low point, it appears to be on the side in this photo but it is on the bottom, my camera is pointed up and to the right slightly as I lay on the ground.