This Weathermatic valve rebuild kit-bonnet assembly is a replacement bonnet for Weathermatic valves. This bonnet is great for repairing or replacing existing valve bonnets that have fallen into disrepair. Weathermatic products are designed with efficiency in mind. The typical Â½-acre commercial property uses about one million gallons of landscape water per year. On average, properties exceed the landscape watering need by about 38% - or 380,000 gallons. Many properties overwater by as much as 60% - pouring hundreds of thousands of gallons of clean water into our streets and sewers. Weathermatic's primary goal is to reduce over watering wherever possible.