The tube is connected to the lower unit with a small quick connect type fitting most likely. If you drop the lower unit slightly you can reach in with your finger and press down on the top of the small compression type fitting and it will allow the rubber tube to pop out. The more difficult part is when you put it back on because you have to push down on the fitting again and put the tube in at the same time. It definitely helps to have and extra pair of hands, and it really doesn't hurt to have long skinny fingers.
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