The evolve ShowerStart TSV3 is the eco-friendly solution to saving water and knowing the right time to hop into the shower. The evolve ShowerStart TVS3 uses an integrated temperature sensor to detect when the water reaches the best temperature for showering and slows down the water flow so hot water isn't wasted saving you water time energy and money. Simply attach the ShowerStart TSV3 to your showerhead and you'll start saving water and energy while eliminating the guesswork of when your shower is ready. The ShowerStart TSV3 installs between your showerhead and shower pipe. When you turn on your shower the showerhead adapter allows the water to run until the temperature reaches 95 deg F. At that point the adapter slows the flow down to a trickle until you pull on the cord to begin showering. This process saves you from spending excess money and energy on hot water that you aren't using and removes the guesswork out of wondering when your shower is ready. FeaturesShowerStart TSV prevents hot water waste during shower warm upStops water flow when temperature reaches 95 deg F and resumes flow when cord is pulledAttaches to shower arms with 1/2-inch NPT male fittingsContentsShowerStart TSVPull cordPlumber's tapeSpecificationsWeight: 0.15 lbs