Otherwise, all the regular rules of each game apply except that a qualifier of 8-or-better for the Lo hand applies unless a specific statement to the contrary is made. This means that the winning low hand can only contain cards of the value under 9. Hence in Flop games, the Flop must contain three cards of the value of 8 or lower.
In order to qualify for the low half of the pot, the low hand must be 8, 7, 6, 5, 4 or lower. That's why this game is called "8 or better", or simply "Omaha 8".