...then it came to him. Well, his 3-years-old, Anette, came to him, because she had to use the bathroom. Petr realized how small the bathroom was and how much room a child's potty takes up, when it hit him. Why not a child's toilet seat that permanently attaches to the bigger seat and lifts out of the way when it isn't needed? Petr talked to a design engineer. The two tested materials and tweaked Macintosh-aided designs. "We bought a whole bunch of various toilets seats," Petr says. "To be able to take hundreds of needed measurements." Soon they had the final design of the FLIP-N-FLUSH®. Petr began carrying it on business trips and scoured the Silicon Valley for retail outlets. Then a children's mail order catalog promised to list the seat. Soon PU was shipping 4,000 seats a month.