One more thing. The stretched tube I have has factory ends on both ends.One end is kind of a flare (?) that seats between 1/4 nut and male to male adapter. The other end that goes into the john's guess fitting is a larger (5/16")outside diameter than the rest of the tube(1/4"). The 1/4 nut is trapped between these two ends and won't come off. This doesn't appear to be the case with the tube in the picture you provided. Also, my tube is approx. 3' long including 3" stretch. Okay, duh... Sitting here looking at my tube it has a number printed on it. 2319867. I bet that's gonna be some help.