I bought this adapter hose last summer and a few months ago, returned a tank thinking there was something wrong with it as I couldn’t get my Q series to light.  Well, the next tank didn’t work either.  Just had a piece of the plastic washer fall out as I was trying once again to get grill started and looking inside, realized that was all that was left of the washer.  It had apparently crumbled away.  Seeing the reviews, this must be a common issue.  And this hose is expensive!  Love my grill, but not this hose.