The Weathermatic SLWMSS is a stainless steel wall mount enclosure that fits SL 1600 and AL 4800 controllers. It features 16 gauge stainless steel construction with a brushed metal finish. 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%.