I have a glacier bay faucet - it is a kitchen sink faucet, with a sprayer that is built into the faucet - one handle. It is leaking up in the neck, but I can't even figure out how to pull the thing apart to get to whatever is leaking. There is a black plastic piece on the bottom, that is attached and prevents me from seeing inside.

When I turn off either hot or cold water, I'm guessing the sprayer still leaks (which end, I got nothing). There are four hoses coming out of the bottom of the faucet (well, really only three) - 1) hot, 2) cold, 3) black end of sprayer and gray plastic other end of sprayer.