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I had the same problem in our new 2010 Montana about the 2nd time we used it. I have a 6 foot hose connected to my backflush inlet connection in the convenience center. Outside I connect a wye to that hose and then connect a longer hose that runs to the pedistal faucet. When done flushing, I shut off the wye, then open the unused part of the wye to let the water drain out of the 6 foot hose. It quickly releases the inline pressure pushing against the anti-siphon valve. If you don't release the pressure, the pressure will slowly subside releasing the spring in the anti-siphon valve and will release water into the area where the valve is located. There was nothing wrong with your initial valve. Mine was releasing water on the floor in the bathroom vanity which followed the pipes into our garage. i've been doing this for 10 years and not a drip since. The anti-siphon valve is there for a purpose - to prevent contamination of the fresh water supply.
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