I have a question about co2 drop. I'm building a new Keezer, and I've just hooked up all the gas lines to a four-port manifold. It's not hooked to any kegs at this point. I set my regulator to twenty psi last night, and it drops to 15 psi by morning. I've sprayed bubble soap on everything and can't find a leak anywhere. How could I be losing that five psi? I've also dunked the ball lock ends in water with no bubbles showing up. I'm at a loss at the moment. Thanks for any help.