Tank pug size

[Shadow4280]

What size pipe and type of thread do these fit? DF-CN230 and DF-CN232 from E.c . Kraus ?
I've been having the hardest time finding this information.

http://www.eckraus.com/tank-plug-cornelius-gas.html

It seems slightly smaller than a 3/8".

Thanks for you input.

 

[GilaMinumBeer]

For those tanks I wouldn't use anything smaller than a 5 pound pug.

Anything smaller and they end up like this;

 

[sandyeggoxj]

Well pugs are on the small side. I think you could get away with a moderate size pug. If it doesn't fit stop feeding it for a bit. That should help.