One of the most critical tuning aspects of ANY nitrous system. regardless of brand. is the setting of fuel pressure. Every system is designed with a specific fuel pressure (and resulting nitrous/fuel ratio) in mind. Fuel pressure can make the difference between no power (rich) or burnt pistons (lean) and no-hassle. mind-blowing performance. Unfortunately. the gauges used in almost all applications fall pitifully short of accurate. Many can be off by more than 1psi. that’s over 20% @ 5psi! It’s easy to see that no serious racer should be without an accurate flow tool. Now. Nitrous Supply has brought to you a truly affordable flow tool that can accurately simulate the fuel demand of your nitrous system. With a 4” diameter 1% gauge at the heart of this tool. we’ve included the proper adapters and hoses to allow easy flowing of almost any system. At 1%. that’s an error of only 5 HUNDREDTHS of a pound @ 5psi! We even include the proper jet sizes to flow the standard power levels found in Fogger kits. Bottom line: it’s a tool you can’t afford to NOT own!