FILENAMES: Gas_Manifold_1.jpg Gas_Manifold_2.jpg DESCRIPTION: This a diagram and a photo of an adapter for mixing argon and helium gases for TIG welding. Posted by Ernie Leimkuhler . Ernie provided the following description: ================================================================= The manifold is pretty simple. 2 Flow gages, each feeding into one side of a Y-connector. Along the way they each feed through a one way valve. I used Oxygen back check valves (not flash arrestors). Their purpose is to prevent one gas from contaminating the other gas tank. I use good Ball + Tube flow gages made by Smith. It is best to get one with a Helium guage on it since an Argon Guage has much bigger increments. To Make a specific mix, you have to balance the 2 guages against each other and add them together. For instance a mix of 75% Argon and 25% Helium would use these settings. Argon: 15 cfh Helium: 5 cfh This will give you a total gas flow of around 20 cfh, which would be perfect for use with a gal lens collet body. The Helium makes a huge difference on old, dirty, or thick aluminum, and on copper thicker than 3/32" it is a necessity.