Backflow preventer dripping

My irrigation system was installed in spring of 2002, and included a RPZ type backflow preventer (Watts 009). This summer, it has gradually developed a slow leak. It is dripping from the water outlet on the bottom. It has never been exposed to freezing conditions.
Since it is only 2 years old, I can't imagine that the rubber seals have failed already. What could cause this thing to fail so quick? And can they be repaired?
Thanks, John
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It is not unusual for these to develop leaks. Its in there nature the way their designed. I have many checked at work annually and always have some that need rebuilding. The state of Wisconsin requires a person to be a certified technitian to rebuild backflow preventers. You need to check with your State or local codes. They absolutely can be rebuilt.

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I've had mine stick occasionally too. Sometimes banging it a few times with a hammer is all it takes. Otherwise, the top of mine comes off easily. Don't remember exactly what I did, but basicly just took the top off, checked inside, made sure everything moved ok and put it back together and it worked fine.
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I've had mine stick occasionally too. Sometimes banging it a few times with a hammer is all it takes. Otherwise, the top of mine comes off easily. Don't remember exactly what I did, but basicly just took the top off, checked inside, made sure everything moved ok and put it back together and it worked fine.
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