Be careful when using the bubble counter solution on the Milwaukee Regulator. The reason why I sent my back to Milwaukee was the fact that it kept releasing bubbles out of control no matter how I adjusted it. The faster the bubbles come out the more viscous the fluid becomes. If the bubbles continue flowing out of control the fluid can actually be forced through the airline tubing and into the tanks water. This happened to me once, and Milwaukee said it was because their regulators basically arent as sensitive as one might need and may need a half lb needle. this is why I shipped mine to them for the new needle valve, however I just received it back yesterday and they gave me a brand new one (with the same needle valve). So they fixed the broken solenoid, but not the needle problem. I have the Best regulator from Aquarium plants and am going to keep it on my set up. I will only use the Milwaukee in an emergency.