Watts 149071 Floodsafe Water Detector Shutoff for Gas Water Heaters, Right Hand Thread Shuts off the water supply to your water heater, securing the leak, but further protects by shutting off heater's power Audible and visual alarm to alerts owner of water heater leaks Can be connected to remote monitored alarm services Resettable: not a one-time use device For standing pilot gas valve, right-hand thread thermocouple (3/4-Inch size pipe)