1.6 GPF "Standard" Tulip 3? WTF???

!±8± 1.6 GPF "Standard" Tulip 3? WTF???

Never in my life have i seen something like this. A 1.6GPF "Standard" toilet. WHAT THE HELL???!!! it says "anti-siphon" inside the tank, and a loud sucking noise can be heard as the toilet flushes. video not filmed by operator of this channel Any information on this toilet would be greatly appreciated.

1.6 GPF "Standard" Tulip 3? WTF???

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