4" First Flush diverter for rain tank. This water diverter from Rain Harvesting utilizes a dependable ball and seat system - a simple automatic system that does not rely on mechanical parts or manual intervention.
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As the water level in the diverter chamber rises the ball floats, and once the chamber is full, the ball rests on a seat inside the diverter chamber preventing any further water entering the diverter. The subsequent flow of water is then automatically directed along the pipe system to the tank.
Sells for $39.95 plus $30 shipping. This first flush is in excellent condition. It was previously used with a 265 gallon tank and the size of the roof and tank did not warrant a 4" first flush. One arm is glued to a small section of 3" PVC pipe which can be cut and refitted or extended, whichever works better for your system.