1. The ball shall be the regulation white rubber association football not less than 7 nor more than 8 inches in diameter.
2. The goals shall be spaces 4 feet long and 12 inches wide marked "Goal" in large letters. One shall be placed at either end of the tank, 18 inches above the water-line equally distant from either side.
3. To score a goal the goal must be touched by the ball in the hand of an opposing player and the greatest number of goals shall count game.
4. The ball shall be kept on or as near the surface of the water as possible, and shall never intentionally be carried under water. No goal shall be allowed when scored by an under-water pass.
5. The contesting teams shall consist of six a side, with two reserve men who can be substituted at any time when the ball is not in play. A player withdrawn can not return to play. Only six prizes shall be given to the winning team.
6. Time of play shall be 16 minutes actual time, divided in two halves of 8 minutes each and 5 minutes rest between halves. Time occupied by disputes, free trials for goal, repairing suits, and lining up after a goal has been scored shall not be reckoned as time of play.
7. The captains shall be playing members of teams they represent and shall toss for choice of ends of tank. The ends shall be changed at half time.
8. The referee shall throw the ball in the center of the tank and the start for the ball be made only at the sound of the whistle.
9. A ball going out of the tank shall be returned to the place from which it was thrown and given to the opposing team.
10. A mark shall be made four feet from each goal on the side of the tank and an imaginary line between these marks shall be called the four-foot line. No man will be allowed within this line until the ball is within it. The goal-tenders, limited to two, of the defending side are alone exempt from this rule. When the ball is within the goal-line the goal-tenders shall not be allowed any artificial support other than the bottom of the tank.