I think he's talking about removing the portion of it with the retractable collar. Google image search shows some pictures with what looks like a plastic took to install and remove it.

Looks like a quick disconnect coupler. The collar that says GAS-MATE should slide away from the hose and you should be able to pull the hose out. If it's seized I would spray some WD-40 on it and try again. Once you have the hose removed the inside of the collar should have something to help unthread from what it's connected to. If you are able to remove the hose and link another picture I might be able to direct you a little further.