Usage Tips:[Connection] CGA-580 Inlet Connection fits standard Nitrogen, , Helium, and Inert Gas Tanks from any supplier.1/4Inch Male Flare Outlet Connection fits HVAC Charging Hoses for Purging ,Pressure Testing and High-pressure lines. [Accurate Pressure Gaugev] The Nitrogen Gas Regulator has two Easy to read pressure gauge,covered with scratch- plastic protective film and rubber cover.Input: 0-4000PSI.Output: adjustable 0-600PSI.The display show 800PSI that you can rate them at 600PSI, but they are to go up to 800PSI. [ Construction] Our Nitrogen Regulator is made of solid brass,so the can keep good looking in a long time. Precision thread design ensures high sealing performance and avoids gas leakage. You can adjust the nitrogen regulator smoothly and accurately through the T-handle to prevent galling. [Application] The Nitrogen regulator is a standard pressure control valve that reduces the input pressure from a liquid or gas stored in a tank.It is great for HVAC purging,pressure tests,inertization,leakage tests,and Soldering,like the accurate reading of Nitrogen Regulator would help you to adjust pressure before HVAC puring. Please note:the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! Colour:As Shown Material:brass Package Contents: 1 * Nitrogen Regulator Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.