The Combination Pressure/Vacuum Gauge is a high-quality, durable instrument designed to accurately measure the pressure of your swimming pool's filtration system. Featuring a 4-1/2 inch face for easy reading, this gauge operates across a range from -30 to 60 PSI, providing precise monitoring of both pressure and vacuum levels in your pool system. The 1/4 inch bottom mount ensures easy installation and compatibility with most pool filter setups. Built to last, the gauge features a stainless steel case with a sleek black finish, offering both protection and a professional appearance. The glass lens ensures clarity and durability, while the all-brass internals guarantee long-term performance and resistance to corrosion, even in harsh pool environments. This pressure gauge is crucial for monitoring the performance of your pool filter. By indicating the exact PSI (pounds per square inch) within your filter tank, it helps ensure the system is functioning optimally. When pressure readings are within normal range, it signals that water is flowing smoothly through the filter, ensuring efficient operation and preventing damage to your equipment. Note: This product is designed exclusively for use in non-potable water applications (such as swimming pools and spas) and is not suitable for drinking water systems. Whether you're a pool professional or a homeowner, this combination pressure/vacuum gauge is a must-have tool to help maintain the health and longevity of your pool's filtration system.