It's just the copper thing on the end is all, I know fancy scarry name for it
Those come on the end of hoses also.
But I would take it in to your gas supplyer and have it checked out and see what they can do. It may work fine like it is, you won't know until you try it
Is the seal around the neck of that, like an O-Ring or something ?
Ok I see that those two spring things coming off from the sides are what hold down the top. Good you will not build up a lot of pressure inside it then, you should be ok then.