www.pmmag.com/articles/92888-siphonic-dual-flush-toilet
Siphonic Dual-Flush Toilet
July 22, 2009

The new H2Option flushing innovation from American Standard offers the first truly siphonic dual-flush toilet, with strong push and pull action created by forceful but quiet jetted action under the rim. Using as little as 1 gallon of water on the low setting, H2Option scours the sides of the bowl to remove every last trace of paper and waste.
For more information, visit www.americanstandard.com.