LeakSmart by Waxman keeps you in constant control of your home's water supply. The system not only detects leaks throughout your home, but it also shuts off the water and sends you an alert, no matter where you are - all in less than 5 seconds. AC power with battery backup keeps you protected. This kit does Not include the LeakSMART Hub - Wink HUB required for this unit. This kit is for 3/4" pipe (3/4" FIP x 3/4" MIP).