What bulkhead fitting do I need

[Alrednek]

Hi fellas, I’m a new member here and I want to thank you folks for letting me join. I have one question that I need a little help with.
I want to run a 1/2” copper tube through the side of a plastic barrel and the connection
must be water tight. I think it would work fine if it had a compression fitting with a ferrule. I need to be able to let the end of the tube stick out about 6-8 inches so the compression fitting would let me do that. Does anyone have a better idea about how to do this in a better way? If my way is ok does anyone have any idea what that fitting would be named? I need to have an exact name for it so I can search
online and it would help to know exactly what it’s called if I walk into a supply house asking for it. I will appreciate any and all help and I thank you all for reading about my problem.
Thanks, have a great day.

 

[breplum]

I would only trust a bulkhead fitting and thread after. Rethinking bulkhead fittings out of copper tube will not be reliable.

 

[Alrednek]

I would only trust a bulkhead fitting and thread after. Rethinking bulkhead fittings out of copper tube will not be reliable.

 

[Alrednek]

Thank you for your answer. I don’t really understand part of it though. You said that you would only trust a bulkhead fitting and thread after. Can you explain the last part of that sentence about the thread after? I’m not familiar with that wording. Is that a plumbing term or procedure of some sort? Also I should have mentioned that the water in the barrel will not be pressurized it will only have a tiny amount of pressure from the effect of gravity due to being located near the bottom of the little 14 gallon barrel. I do appreciate the response breplum. Thanks

 

[breplum]

I was thinking the bulkhead fittings I have encountered had thread adapters on them( I imagine a lot of variety out in the marketplace), or sometimes you have to attach to the running threads, which are tricky because they are not tapered and thus not designed to seal under pressure.