Two Hour Water Timer with 15 Minutes Increments

this timer just doesnt work well. upont arrival i installed and tested the "on position"... which worked, then i twisted "15 min" of time.... it worked, then i set it for 2 hours to fill up a reservoir for my garden (i had it timed out how long it took to fill up 20 gallons), and it plain out never counted down. i came back some time later to an overflowing reservoir and water all over the place. i assumed since the 15 min function worked, that the 2hr would work too. this is pretty much a glorified valve now, either on, or off, didnt work as a timer.

Both self-destructed the same way after the first use. Do not try these. The problem seems that cheap plastic is not strong enough.