1st, are your sure the valve is leaking? it could be the simple factors of, the mouthpiece not being tight on the body of the regulator and are you sure that you have a good fit/bite on the mouthpiece? Ive seen where a diver has been in a position and or turned head and the hose can put the mouthpiece in a position that water enters on a inhale, If these are not a factor, then I would return it right away since it should still be under warranty