Okay, I purchased copies of the camper's manuals, and there in no where shows this blue/red hoses. Can anyone please tell me how to open them? The cap does not come out at all, I attempted to unscrew the second ring but there is nothing to come out, unles I yank the top cap from the inside the hose, (the top cab is inserted approximately 1/2 to 1 inch long inserted into the hose. Suggestions? I do not want to pull that cap from inside the hose and then I can not put it back later.