The Prime-Pro™ is activated when sensing potable water flowing at an adjacent plumbing fixture. This trap priming device must be installed on the cold-water line leading to the plumbing fixture, the valve then emits fresh cold potable water to a floor drain trap as long as the fixture is in use, providing an adequate trap seal. The Prime-Pro™ trap primer is equipped with vacuum breaker ports and internal back flow protection to prevent cross connection. The valve is factory pre-set and 100% function tested prior to being labeled and boxed. The Prime-Pro™ trap priming valve is designed for one-to four floor drain trap seal applications. The valve is activated at a minimum flow rate of 0.25 gpm at 20 psig.