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Good day, Drew! The water supply line should be ¼" (6.4 mm) outer diameter, made of copper or stainless‑steel tubing. Plastic tubing is not recommended due to a higher leak risk and may void the warranty. The same tubing size applies to either material: copper or braided flexible stainless steel is acceptable. - Kit 5304490728: 6‑foot stainless steel water line (for homes with existing shut‑off valve). - Kit 5304490717: 20‑foot copper water line with self‑tapping saddle valve (for homes without an existing valve). - Maico
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