We have the 310, and it's about 4 years old now. I don't think the valve is all that fragile, but any plumbing part will fail if it has water in it and it freezes. And yes, Dometic has specific instructions about winterizing to prevent damage due to freezing conditions.
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Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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