Came off the hose barb, clamp and all. Since the hose barb is plastic you can only get it "so" tight without cracking it, plus the walls of the 1" tubing are very thick. I had to heat the tubing in boiling water to even get it over the hose barb, and then clamped the crap outta it. I tried removing it once, and couldn't get it off without boiling water, and couldn't exactly get that in the right place!!
I gave up, and the return pump blew it off for me! Not good. There was a lot of back pressure though because there was a ball valve holding back the return pump. There's no way the sidewall would tear. It's really thick.