I pressurize the system ONLY to introduce antifreeze into the plumbing. After I'm finished, I turn off the water pump and open all of the faucets. When faucets are closed, there is no ability for anything inside the valve to escape, so any expansion would crack or damage the valve and/or the O-rings inside. So, by opening all of the faucets, I eliminate any potential for "trapped water/antifreeze to cause any damage if expansion should occur. The only valve I do NOT leave open is the toilet flush valve. I want to prevent any odors or flies if it warms up, from having access to the interior of the trailer. I pour about 2 cups of antifreeze into the toilet bowl to form a "liquid seal" above the flush ball.
Quick answer: Depressurize your system during storage. If you think about it, eventually it's going to "leak down" anyway.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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