PRB-100 - 1" Pressure Regulating Basket FilterRain Bird PRB 100 1" Pressure Regulating Basket Filter Made of durable, glass filled nylon, the Rain Bird PRB 100 combines a commercial grade filter with a built in pressure regulator to ensure clean, even water in low volume irrigation zones. The unique basket filter design allows the element to be accessed vertically which makes maintenance fast and easy, while ensuring that dirt does not fall back into the filter during cleanup operations. The PRB