Originally Posted by 73shark
Most locks of that type have a retaining mechanism. I wonder if they left something out since this seems to be a problem with more than just one.
This has a retaining mechanism, but the spring for the retainer is weak (I'm guessing for ease of assembly purposes). The instructions says to use the key to extract the insert, but the tumbler pulls out instead due to the weak spring. It would probably work ok on a straight inlet pipe, but our Interstates uses a curved water inlet pipe.