Efficient effective rim flush action uses about a pint (.5 liter) of fresh water per flush from on-board demand system. Integral anti-siphon vacuum breaker protects potable water supply. Requires no electricity * Fresh, clean operation means there are none of the nasty odors common to saltwater flushing toilets. Our exclusive self-cleaning flush ball with teflon seal locks out holding tank odors * Measures 18-3/4 inch in back height * Measures 17-1/8 inch in front height * Measures 20-1/2 inch in depth