The mechanical water flow timer allows for simple and quick irrigation programming. Using the large adjustment knob, you can easily regulate the valve opening time without any manual intervention. Particularly useful for more efficient evening or nighttime watering. The housing of the DEDRA 80N300 irrigation system’s mechanical timer is made of durable ABS and PP plastic. The automatic valve can be mounted on 3/4" and 1" tap connectors, with a maximum operating time of 120 minutes.