Speakman Reaction Single-Function Spray Pattern 2.5 GPM Shower Head in Polished Chrome Finish With Jade Green FrameThe Speakman Reaction S 4001 E15 1. 5 GPM Low Flow Single function Shower Head is a powerful, more fashionable way to conserve. Patented TempoFlo Technology infuses energy into every spray resulting in a pulsating, spiraling stream that is remarkably sensual. Our team of engineers developed a single function spray setting that concentrates and optimizes water pressure, creating an exceptionally powerful shower head for low pressure installations.