Thanks Anthony. I was wondering , it looks like there is some locking cement on the threads , but it appears whitish in color.
This is probably teflon tape and can be removed easily.
Can I turn it off from the outer locking nut which is located just behind the adjustment knob? A new needle valve assembly would just replace that whole section including the part that holds the tubing as well? or just the outer locknut where the dial is located?
As I asked in my previous message, what needle valve are you using? In addition, a photograph of your current setup would be helpful.
The 40 dollar range sounds like the better deal in my case. Thanks again
You may be able to find cheaper options if you are patient on eBay. The $40 for the Fabco NV-55 is what I was quoted for a brand-new, retail priced valve.