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You need a Camco RV blow out plug. Drain your fresh tank, then run the pump dry. Close all faucets. Set the air compressor to 50-60 psi, air the the water system to 50 psi, go inside and flush each plumbing device. The city water inlet is a one way valve, so it's like putting air in a tire. I did this by myself and three air ups to blow the water out. Don't forget outside shower. I use a wet/dry vacume to empty the drains. Then drain and flush your tanks. https://www.amazon.com/Camco-36104-Plastic-Blow-Plug/dp/B0006JLW3E
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