Our landlord has sent a couple of workers to fix few things at home; while they where fixing stuff they've used a faucet which we use for drip irrigation. They removed our irrigation timer, take some water, then re-installed the timer.
At the same time, by chance, there was some water supply issue on our apartment building. So the plumber cut off the water supply upstream, fixed the issue and later on restored the supply.
Ok, so here is the issue, after restoring the water supply the irrigation timer broke/jump from the faucet. The timer has a hard plastic thread.
The workers tell us that is because of the sudden pressure increase caused by the restored water supply. That the trapped air in the pipes with the water created a pressure spike. Is that a possible explanation?
I've the intuition that the trapped air wouldn't affect, it'll just increase pressure until it equals the water pressure (I need to consult with a physicist though). We think they just didn't thread completely the timer. Also, we don't see any apparent signs of wear on the thread (I assume that if it was removed forcefully some wear should be visible… it's not rubber).
So… does the workers story make sense?