A hard freeze, possibly down to 22°F, is predicted in a few days. Lowest temps mostly in the wee-morn hours but at least one day may not reach much above 32°F for the duration. I have three washers on my patio with essentially no room for them in the garage unless I leave the car out. Two WP DDs and an F&P EcoSmart. The inlet valves are drained (hoses disconnected) and I can drain the pumps ... but am concerned about the balance rings. I know the balance rings are only partially filled so is there any risk of damage?