ORIGINAL: RCISFUN
Look at post #17, according to Bob they are hysol'ed into place[X(]
And yes the rubber stopper is inserted into the Aluminum part.
I got that part. So the brown stopper will just squeeze into the inner hole and just stay there despite any tank pressure?
I know with the dubro versions you have the screw and plates to squeeze the stopper so that it exands on the hole.
Put me on your list......I'd need 3 for my JL F-16 tanks