What diameter tubing is used with the Delonghi DE 500P pump
George, regular garden hose is what is generally used for continual drainage. Just don't exceed the maximum length of hose, that is listed in your Owners Manual.And, despite what they say about being able to pump water up thru abasement window, it really doesn't work that well. Unless the unit is right below the window,
Hope this helps you and thanks for choosing FixYa.
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