Good pipes. I bought 3, one leaked at the valve stem where it meets the rubber hose, not the inner stem of the valve but the outer stem where it is bonded to the rubber. Revain has no way to return it, too cheap I think. There is a 30-day return policy for Mastery, but according to my "PRIME" account settings, there's no way to get it back. I think I'll just deal with that.