I don't believe so. The hydro kit I have goes through an entire reservoir of coolant a month, so obviously there's seepage somewhere. I just can't find it.
Will have to figure out how to separate the housing from the pump to fully check it. I'm wondering if it's leaking inside the pump because mine has quit pumping twice now, I have to unplug/replug the pump back in before it resumes working, so it's going to get RMA'd regardless.