Leave it to a musical called Urinetown! to be flush with success.

Greg Kotis and Mark Hollmann's satirical show, on view as part of the New York International Fringe Festival, extended its run one week past the Fest, through Sept. 4.

Set in a gotham-esque city where the privilege to relieve oneself is regulated by a single corporation, Urinetown uses the basic melodramatic themes of greed, corruption and betrayal to portray a time where water is worth its weight in gold.

The production is put together by Theatre of the Apes -- that is, improv all-stars Kotis (of the Neo-Futurists) and Hollmann (of Second City and Chicago City Limits). Joseph P. McDonnell directs.

Hollmann told Playbill On-Line (Sept. 1) the extension was mainly intended to get producers to see the show, in the hopes of a small (but Equity contract) Off-Broadway transfer. No word yet on whether that will happen, but the show has certainly been one of the most talked about and popular of the Fringe Fest, even winning the "FringeXcellence Award" in the category Overall Excellence - Musical. "We need to capitalize on the current momentum," Hollmann said. "Greg and I just weren't expecting this response to the show. Especially since agents were telling us that with a title like Urinetown!, no one was going to go near it."

The production plays at the Fringe Fest's homebase, The Present Company Theatorium (198 Stanton St). For tickets or more information, call (212) 420-8877.