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You have to drop the belly pan to get at them. You may also want to re think the foam tubeing. If the lines are close together, heat from the hot line keeps the cold line warm. If I was going to insulate to freeze proof, I'd wrap around the two lines, and not separate them. There is heat in the belly from the furnace. Ours froze up where the factory put insulation on top of the tube by mistake, insulating it from the warm air space. In the 3670RL it is a simple matter to go from the kitchen right into the basement eliminateing the belly altogether. Two 3 foot tubes replaced two 20 foot tubes..
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