Senninger irrigation water pressure regulators maintain a constant preset outlet pressure with varying inlet pressures, which alleviates pressure differences that can cause an applicator’s area of coverage to change. 100% pressure tested, to ensure quality and performance. Very low hysteresis and friction losses. Can be installed above or below ground. Patented tamper-proof design. No external metal parts for excellent corrosion resistance. Two-year warranty on materials, workmanship and performance.