This accurate and reliable Flow Meter is useful for metering the amount of water going into your brew system. It can be particularly useful when adding sparge water to add the precise amount needed to hit your pre-boil target. It is recommended to install it in a horizontal orientation and flow rate should exceed 0.25gpm for accurate reading. Connects to either a 3/4" NPT coupling, or 1.5" tri-clamp compatible ferrules. This meter has been tested and certified by the Water Quality Association to meet ANSI/NSF Standard 61 for materials safety, and ANSI/NSF Standard 372 for lead free compliance and has a measuring precision of 0.01gal/1.3oz/37mL.