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Its there for a reason. A rubber line directly on the metal piping will weaken due to the heat with in time. It as well does not provide a good seal with the high heat. Thus the quick disconnect allows the plastic to become the point of contact to join the rubber hose and the metal hose.
Ofcoarse they weaken as well over time but have a longer life span and help seal properly. Rust is the main issue and water is the main factor.
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