Join Date: Sep 2010
Location: Sacramento, California
The two threaded size opening on ALL the ASA On/Off Valve are 1/8" Male NPT. That being said, Any Needle Valve that comes up that doesn't have 1/8'' NPT Thread, it won't screw in.
That Needle Valve you listed above in your link states it's..
"Inlet - Male Threaded NPT 1/8" (measures 1/4" OD physically) / Outlet - Hose Barb 1/8" (or 4/6 mm ID/OD tubing). This is the valve supplied with our Econo CO2 regulators."
I would say base on the description that it will work screw in fine, as far as fine adjustment, I do not know anything about how it works other than it will screw onto the ASA On/Off Valve. Now, on the Outlet - Hose Barb 1/8" (or 4/6 mm ID/OD tubing), you might need to find a co2 hose to fit that. I believed the one I'm using is a 8mm size. 4mm/6mm would be a bit big.
Hope that clears up some confusion. All Needle Valve needs to be 1/8'' NPT to screw into the ASA On/Off Valve, Keep that in mind.
This is also regarding gauges. Any brand type gauge will work, doesn't matter if it reads 400psi max or all the way to 3000psi. It must have a 1/8'' NPT to screw into the ASA On/Off Valve if you want to use a gauge.
She winks, Let's dance.