[rysybel]

I already have a regulator for this CO2 tank and need a needle valve to facilitate the rest of my setup. The output is a 5/8"-18 RH thread. Any ideas? Industrial suppliers fine

 

[Darkblade48]

You may have to use a reducer to a more common sizing for needle valves that have the necessarily low flow rates for aquarium purposes.

Usually 1/8" is a good size to reduce to. Ideal, Fabco, Swagelok all make good valves

 

[rysybel]

You may have to use a reducer to a more common sizing for needle valves that have the necessarily low flow rates for aquarium purposes.

Usually 1/8" is a good size to reduce to. Ideal, Fabco, Swagelok all make good valves

Do you know of any sources for larger needle valves? I'm not actually making an aquarium, so I think a higher flow rate would probably be okay

 

[jeffkrol]

Do you know of any sources for larger needle valves? I'm not actually making an aquarium, so I think a higher flow rate would probably be okay

You need to give more details.
In aquariums CO2 flow is extremely low most having 1 to 3 degrees of taper and small orifices and flows like 10-50 ml gas/ minute.


There are needle/ metering valves in all sizes as well as rotometers.

Looks like Radnors are rebranded Victors.
You can remove the outlet end, should be 1/4 npt on the body, put a 1/4 nipple on a female coupler and a flowmeter.
Not sure what 60gph translate into gas terms ( most can handle both) but it's only about $45 at the e of bay.

King Instrument 7530 Series Flowmeter, 60 GPH, 1/4" NPT Fitting