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The Ultimate Release Valve Upgrade, works on any existing RainHarvesting First Flush System. This convenient, simple upgrade allows users to control the drip rate, or time it takes the first flush chamber to drain, adjustable anywhere between a few minutes to several weeks. Have complete control over the first flush drip rate O-ring and swivel design allows for front orientation, every installation Minimal maintenance A unique sleek cover and cap provides a stylish, integrated look New clear end cap allows for sight verification