I'm trying to go from my spund valve to a sanke. This is a picture of what I want to do.
Here's a picture of the parts I have:
Here's the part I got from mcmaster.com
50675K161 Brass 37 Degree Flared Tube Fitting Adapter for 1/4" Tube OD X 1/8" NPT Male Pipe
Unfortunately, I realize now I probably have the wrong part as this is meant for 1/4" OD tube and my hose barb is 5/16". Is there a way I can make this work? Or can you recommend a way for me to get from the 1/8" NPT male pipe fitting to the sanke gas in?
Really appreciate it. I'm not much good with fittings, especially gas.

Here's a picture of the parts I have:

Here's the part I got from mcmaster.com
50675K161 Brass 37 Degree Flared Tube Fitting Adapter for 1/4" Tube OD X 1/8" NPT Male Pipe
Unfortunately, I realize now I probably have the wrong part as this is meant for 1/4" OD tube and my hose barb is 5/16". Is there a way I can make this work? Or can you recommend a way for me to get from the 1/8" NPT male pipe fitting to the sanke gas in?
Really appreciate it. I'm not much good with fittings, especially gas.