What is the minimum hose diameter required for a pressure gauge used in backflow testing?

The minimum hose diameter required for a pressure gauge used in backflow testing is 1/4 inch. This size is ideal as it strikes a balance between providing accurate readings and allowing for efficient pressure flow. A 1/4 inch diameter is typically sufficient to ensure that the gauge can measure pressures effectively, as well as reducing the risk of pressure drop or lag that might occur with smaller diameters. Additionally, this size is generally compatible with standard fittings and hoses commonly used in backflow prevention testing, making it a practical choice for professionals in this field. Ensuring that the appropriate diameter is used is vital for the reliability and accuracy of the testing process, which is essential for safeguarding public health and ensuring compliance with plumbing codes.