It was on the side of the box. I never heard of it either so maybe it's new and they haven't started selling them yet? It's not on their web site either.
On the left under the picture of the cleaner with the funny box cover it says: "Return Side Pressure OR Dual PoolCleaner*"
The footnote * is under the blue star with the picture of the pressure hoses and it says: "Dual PoolCleaner ships in "pressure mode" but can be converted to a suction cleaner with OPTIONAL conversion kit."
On the left under the picture of the cleaner with the funny box cover it says: "Return Side Pressure OR Dual PoolCleaner*"
The footnote * is under the blue star with the picture of the pressure hoses and it says: "Dual PoolCleaner ships in "pressure mode" but can be converted to a suction cleaner with OPTIONAL conversion kit."