Why would new plumbing fixture leak?
I had a new water control valve installed in my upstairs shower. From time-to-time I hear water drip out. It's only a few drops, then stops. I put a bucket under the shower head for an entire day & the total amount was insignificant. Even so, the leaks shouldn't be happening on an all new system, after all, the 25 yo valve that was removed didn't leak, at all. Also, this happens even if it has not been recently used. I don't know where or why the water is coming out. Yes, it is all the way off, & after it was installed the internal washers were cleaned.