If you have a full hook up do you leave tanks open or close. Hubby said I am wrong I say both should be closed till full for persuit to empty need to win this one. I really think I am right, help me o...
We left both closed. Leaving the gray open and with constant trickles of greasy or soapy water, you sewer hose will look and smell awful. If the gray tank never receives full water, the bottom of that tank will also be greasy.
Not a choice to leave the black open. It would be foolish to do so.
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